SPOILER WARNING: Information below is not available in game manual but it is available at start of the game - even so it could be treated as spoiler by some users.

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INTRODUCTION: I was looking for more detailed descriptions of abilities and skills. Unfortunately, there are no details about that in official manual but I've found three videos ( Is It Worth It?: Legend of Grimrock, WTF Is...: Legend of Grimrock, Let's Look At - Legend of Grimrock) with a lot of different info. The only problem was to gather all this info in one place - so I opened notepad and "started fun" with pause mode. :D Now, after gathering all possible information from these videos I thought I could share it with you, so here it is. :) Have fun and let me know if you find any errors / misspells. ;)

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RACES

Human [H]
Humans are the most populous of the sentient races in the world. They are very adaptable and can excel in all professions.
Skillpoints:4

Minotaur [M]
Minotaurs are bulky, simple and keen to violence. They are tolerated in cities only because of their ability to do labor that demands great strength and stamina.
Strength +5 Dexterity -4 Vitality +4 Willpower -3
Skillpoints:1 Food Consumption +20%

Lizardman [L]
Lizardmen are social outcast and generally mistrusted due to their capricious and deceitful nature. They are superb in tasks requiring stealth and dexterity.
Dexterity +2 Willpower -1
Skillpoints:3

Insectoid [I]
Insectoids mostly keep to themselves and rarely wander into the lands of humankind. It is believed that their knowledge of the arcane is unrivaled.
Strength -2 Dexterity +1 Vitality -2 Willpower +4
Skillpoints:3 Food Consumption -15%

CLASSES

Fighter [F]
Fighters are the masters of close combat and they are trained to use a wide variety of weapons and armor.

Mage [M]
Mages use their enchanted staves and orbs to command mystical powers that can be used to cause harm or to protect.

Rogue [R]
Rogues are stealthy warriors who can fight with ranged weapons or sneak behind enemies for deadly backstab attack.

ATTRIBUTES

Health
H/F:60 H/M:35 H/R:45
M/F:70 M/M:45 M/R:55
L/F:60 L/M:35 L/R:45
I/F:55 I/M:30 I/R:40
Health is the ability to resist pain and withstand injuries. Character class and Vitality affects the number of Health points gained at first and subsequent character levels.

Energy
H:50 M:42 L:47 I:60
Energy is the ability to act. Strenuous activity such as special attacks and spellcasting consume energy and running out of energy prevents these actions. Willpower affects the number of energy points gained at first and subsequent character levels.

Strength (take a look at the attachment for more data)
H:10 M:15 L:10 I:8
Strength is the physical prowess and strength of the character. It increases your Attack Power and carrying capacity.

Dexterity (take a look at the attachment for more data)
H:10 M:6 L:12 I:11
Dexterity id the ability to move quickly and perform maneuveurs that demand accuracy and a keen eye. Accuracy and Evasion are based on character's Dexterity.

Vitality (take a look at the attachment for more data)
H:10 M:14 L:10 I:8
Vitality represents the overall health and stamina of your character. It affects the amount of Health points gained at first and subsequent levels and helps to get rid of harmful conditions.

Willpower (take a look at the attachment for more data)
H:10 M:7 L:9 I:14
Willpower is the force of the mind and the ability to manipulate arcane powers. It affects the amount of Energy points gained at first and subsequent levels.

Points Left
H:10 M:10 L:10 I:10

Attack Power
H:1 M:3 L:1 I:0
Attack Power represents the damage output of the character's physical attack. Attack Power is based on Strength, skills and equipped weapon.

Accuracy
H:0 M:-4 L:2 I:1
Accuracy affects character's chance of hitting a target in melee combat. Accuracy is determined by Dexterity, skills and equipped weapon.

Protection
H:0 M:0 L:0 I:0
Protection is the combined Protection value of all equipped armor, clothes and other defensive gear. Protection decreases physical damage of attacks against the character.

Evasion
H:0 M:0 L:2 I:0
Evasion affects the character's chance of evading physical attacks. The damage from an evaded attack is completely negated. Evasion is determined by Dexterity, equipped shields and other gear.

Resist Fire
H:0 M:0 L:2 I:1
Resist Fire lowers the damage of fire, steam and heat based attacks. High Dexterity grants bonuses to your character's fire resistence.

Resist Cold
H:0 M:8 L:0 I:0
Resist Shock lowers the damage of icy and cold attacks. High Vitality grants bonuses to your character's cold resistence.

Resist Poison
H:0 M:8 L:0 I:0
Resist Shock lowers the damage of poisonous attacks. High Vitality grants bonuses to your character's poison resistence.

Resist Shock
H:0 M:0 L:2 I:1
Resist Shock lowers the damage of lightning and electrical attacks. High Dexterity grants bonuses to your character's shock resistence.

Max Load
H:45kg M:60kg L:45kg I:39kg
Load affect movement speed of the party. If one or more prisoners are Burdened (yellow bar) movement speed slows down. If one or more prisoners are Overloaded (red bar) the party can't move.

Available Skill Points
H:4 M:1 L:3 I:3

SKILLS: FIGHTER

Athletics
This skill represents the time spent in exercising your physique. Spending points in this skill increases your physical ability scores.
Lvl Ability
2 Strength +1
5 Vitality +2
8 Health +10
10 Endurance (Decreases food consumption rate by 25%)
12 Dexterity +2
16 Strength +2
20 Porter (Increases carrying capacity by 15kg)
22 Vitality +2
24 Dexterity +2
28 Health +10
30 Resist Fire +10, Resist Cold +10
33 Strength +2
38 Vitality +2
40 Resist Poison +10, Resist Shock +10
45 Health +10
50 Iron Body (Health +100)

Armors
Armors skill represent fighter's knowledge of armors and defensive combat techniques. Spending points in this skill improves the effectiveness of equipped armor and your character's defensive abilities.
Lvl Ability
2 Protection +1
5 Health +10
8 Light Armor Proficiency (No penalties from wearing light armors)
12 Health +10
16 Heavy Armor Proficiency (No penalties from wearing heavy armors)
19 Health +15
22 Protection +2
25 Shield Expert (Doubles evasion bonus of equipped shield)
28 Health +15
33 Evasion +5
35 Health +25
38 Protection +2
44 Health +25
50 Armor Master (Protection +25)

Axes
This skill represents your character's training with axes. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting with an axe.
Lvl Ability
4 Strength +1
7 Health +5
10 Chop (Useful technique for chopping firewood and severing limbs of an enemy)
14 Health +5
18 Strength +1
22 Cleave (A mighty blow that deals huge amount of damage)
26 Health +1
29 Strength +1
33 Rampage (An extremely powerfull attack dealing massive damage)
38 Health +5
42 Strength +1
46 Health +5
50 Axe Master (Attack Power +20 when wielding an axe)

Maces
This skill represents your character's training with maces. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting with an mace.
Lvl Ability
4 Vitality +1
7 Health +5
10 Bash (A bone shattering blow that deals double damage)
13 Vitality +1
17 Health +5
20 Crushing Blow (A powerful smash that deals great damage)
24 Vitality +1
28 Health +5
33 Devastating Blow (A ground trembling attack that partially bypasses enemy's armor)
38 Vitality +1
42 Health +5
46 Vitality +1
50 Mace Master (Attack with maces ignores enemy's armor)

Swords
This skill represents your character's training with swords. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting with an sword.
Lvl Ability
4 Strength +1
7 Health +5
10 Slash (A powerful slash that cuts flesh to the bone)
13 Energy +5
16 Parry (Evasion +5 when wielding a sword)
19 Dexterity +1
23 Thrust (Apowerfull attack that pierces enemy's armor)
26 Health +5
29 Strength +1
33 Flurry of Slashes (A deadly chain of attacks that shred enemies to pieces)
37 Energy +5
42 Health +5
46 Dexterity +1
50 Sword Master (Doubles attack speed with swords)

Unarmed Combat
This skill represents your character's training in unarmed combat. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting unarmed.
Lvl Ability
4 Dexterity +1
7 Health +10
11 Jab (A precise punch dealing some extra damage)
15 Dexterity +2
19 Health +10
23 Kick (A powerful kick dealing double damage)
27 Health +10
30 Faster than Lightning (Evasion +20)
34 Strength +2
38 Dexterity +2
42 Strength +5, Dexterity +5
45 Health +10
50 Three Point Technique (A secret technique only known to Grand Masters)

SKILLS: MAGE

Air Magic
This skill represents your character's training in Air Magic. You obtain the power to cast new spells and increase the efficiency of air spells as you advance in this skill. In order to learn a spell you also need to find a scroll explaining the runes of the spell.
Lvl Ability:
4 Spell: ???
5 Resist Shock +10
9 Spell: ???
11 Dexterity +1
14 Spell: ???
17 Resist Shock +10
19 Spell: ???
22 Spell: ???
25 Dexterity +1
27 Greater Lightning Bolt (Your Lightning Bolt spells are much more powerful)
30 Resist Shock +10
32 Circle of Protection, Air (All party members gain Resist Shock +25)
35 Dexterity +1
39 Resist Shock +10
44 Dexterity +1
50 Air Mastery (Resist Shock +100)

Earth Magic
This skill represents your character's training in Earth Magic. You obtain the power to cast new spells and increase the efficiency of earth spells as you advance in this skill. In order to learn a spell you also need to find a scroll explaining the runes of the spell.
Lvl Ability:
3 Spell: ???
7 Spell: ???
9 Resist Poison +10
11 Spell: ???
13 Spell: ???
17 Vitality +1
19 Resist Poison +10
23 Improved Poison Bolt (Your Poison Bolt spells are much more powerful)
26 Vitality +1
29 Resist Poison +10
32 Circle of Protection, Earth (All party members gain Resist Poison +25)
35 Vitality +1
39 Resist Poison +10
44 Vitality +1
50 Earth Mastery (Resist Posion +100)

Fire Magic
This skill represents your character's training in Fire Magic. You obtain the power to cast new spells and increase the efficiency of fire spells as you advance in this skill. In order to learn a spell you also need to find a scroll explaining the runes of the spell.
Lvl Ability
2 Spell: ???
6 Resist Fire +10
7 Spell: ???
10 Strength +1
13 Spell: ???
16 Spell: ???
19 Resist Fire +10
21 Strength +1
24 Greater Fireball (Fireballs cast by you are much more powerful)
28 Resist Fire +10
32 Circle of Protection, Fire (All party members gain Resist Fire +25)
35 Strength +1
39 Resist Fire +10
44 Strength +1
50 Fire Mastery (Resist Fire +100)

Ice Magic
This skill represents your character's training in Ice Magic. You obtain the power to cast new spells and increase the efficiency of ice spells as you advance in this skill. In order to learn a spell you also need to find a scroll explaining the runes of the spell.
Lvl Ability
3 Spell: ???
5 Resist Cold +10
7 Spell: ???
10 Willpower +1
13 Spell: ???
16 Resist Cold +10
19 Spell: ???
21 Willpower +1
24 Improved Frostbolt (Your Frostbolt spells are much more powerful)
28 Resist Cold +10
32 Circle of Protection, Ice (All party members gain Resist Cold +25)
35 Willpower +1
39 Resist Cold +10
44 Willpower +1
50 Ice Mastery (Resist Cold +100)

Spellcraft
Spellcraft skill represents your overall prograss in the way of magic. Advancing in this skill enables you to cast more spells before exhausting your energy reserve.
Lvl Ability
2 Willpower +1
5 Spell: ???
5 Spell: ???
6 Energy +10
8 Willpower +1
10 Combat Caster (25% faster spell casting)
12 Energy +10
15 Willpower +1
18 Improved Combat Caster (50% faster spell casting)
22 Energy +10
26 Willpower +1
30 Energy +10
34 Willpower +1
38 Energy +10
42 Willpower +1
46 Energy +10
50 Archmage (Spell energy cost are reduced by 50%)

Staff Defense
This skill improves mage's defensive abilities.
Lvl Ability
2 Protection +1
5 Evasion +5
8 Health +10
11 Protection +2
14 Light Armor Proficiency (No penalties from wearing light armors)
18 Evasion +5
22 Health +10
27 Evasion +5
32 Health +10
37 Protection +2
42 Evasion +5
50 Staff Master (Protection +10, Evasion +30)

SKILLS: ROGUE

Assassination
This skill represents your training in the way of assassin. As you progress in this skill you gain access to deadly and precise melee techniques.
Lvl Ability
4 Strength +1
8 Backstabbing (Double damage when attacking enemy from behind)
12 Reach Attack (Attack with melee weapons from back row)
16 Strength +2
20 Improved Backstabbing (Triple damage when attacking enemy from behind)
23 Quick Strike (25% faster attack rate with melee weapons)
27 Strength +2
31 Improved Critical (Doubles chance of scoring a critical hit)
35 Piercing Attack (Reduces target's protection by 10)
40 Strength +2
45 Improved Quick Strike (50% faster attack rate with melee weapons)
50 Master Assasin (?)

Daggers
This skill represents your character's training with daggers. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting with a dagger.
Lvl Ability
4 Dexterity +1
7 Energy +5
10 Stab (A precise attack that deals double damage)
14 Energy +5
18 Dexterity +1
22 Piercing Strike (A stab that pierces through enemy's armor)
26 Energy +5
29 Dexterity +1
33 Flurry of Slashes (A deadly chain of attacks that shred enemies to pieces)
38 Energy +5
42 Dexterity +1
46 Energy +5
50 Death Strike (An extremely deadly attack that slays most enemies)

Dodge
This skill improves rogue's defensive abilities.
Lvl Ability
2 Evasion +5
5 Evade (Resist Fire +5, Resist Shock +5)
8 Health +15
11 Stealth (Doubles evasion bonus of equipped cloak)
14 Evasion +5
17 Light Armor Proficiency (No penalties from wearing light armors)
20 Health +15
24 Improved Stealth (Doubles evasion bonus of equipped clothes)
28 Resist Poison +20
32 Evasion +5
34 Greater Evade (Resist Fire +25, Resist Shock +25)
38 Health +15
42 Evasion +5
46 Health +15
50 Ninja Archer (Evasion +50)

Missile Weapons
This skill represents your character's training with missile weapons such as slings, bows and crossbows. Attack Power with these weapons increases as you progress in this skill.
Lvl Ability
4 Dexterity +1
8 Energy +5
12 Quick Shot (25% faster attack rate with bows)
16 Dexterity +1
20 Energy +5
24 Improved Quick Shot (50% faster attack rate with bows)
28 Energy +5
32 Volley (Shoot 2 missiles with single shot)
36 Dexterity +1
40 Energy +5
45 Dexterity +1
50 Master Archer (Doubles chance of scoring a critical hit with missile weapons)

Throwing Weapons
This skill represents your character's training with throwing weapons. Attack Power with throwing weapons increases as you progress in this skill.
Lvl Ability
4 Strength +1
8 Health +5
12 Quick Throw (25% faster attack rate with throwing weapons)
16 Strength +1
20 Health +5
24 Improved Quick Throw (50% faster attack rate with throwing weapons)
28 Strength +1
32 Double Throw (Throw two items with single attack)
36 Strength +1
40 Health +5
45 Strength +1
50 Throwing Master (Doubles chance of scoring a critical hit with throwing weapons)

Unarmed Combat
This skill represents your character's training in unarmed combat. By increasing this skill your Attack Power, Accuracy and chance of performing special attacks increases. The aforementioned bonuses apply only when fighting unarmed.
Lvl Ability
4 Dexterity +1
7 Health +10
11 Jab (A precise punch dealing some extra damage)
15 Dexterity +2
19 Health +10
23 Kick (A powerful kick dealing double damage)
27 Health +10
30 Faster than Lightning (Evasion +20)
34 Strength +2
38 Dexterity +2
42 Strength +5, Dexterity +5
45 Health +10
50 Three Point Technique (A secret technique only known to Grand Masters)

TRAITS

Aggressive
You are full of rage
Attack Power +4

Agile
Your reflexes are exceptional
Dexterity +2

Athletic
Your body is muscular
Strength +2

Aura
You have a potent aura
Energy +15

Cold-blooded
You are naturally resistant to cold
Resist Cold +25

Evasive
You know better to stay away from harm
Evasion +7

Daemon Ancestor
Your Great Granfather had fiery eyes
Resist Fire +25

Fist Fighter
You know how to survive tavern brawls
Attack Power +6 when unarmed

Head Hunter (Minotaur)
Required Race: Minotaur
Attack Power +3 for each skull carried

Healthy
You are exceptionally healthy
Vitality +2

Natural Armor (Insectoid)
Required Race: Insectoid
Your skin is very thick and armor-like
Protection +5

Poison Resistant
You are naturally resistant to poisons
Resist Poison +25

Skilled
You are learned
+3 Skillpoints

Strong Mind
Your mind is shard as a needle
Willpower +2

Tough
You are resistant to physical punishment
Health +15

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My posting is finished, now you can post your comments below if you want.

Lexor, You are the freaking MAN!!

I cannot wait for this to drop. Nicely done!

I agree,
sterling work man +1 for hard work!.
I haven't fiended this hard for a game in years...

How is stealth/sneak/backstab handled in this game when you can not control any single character?

Wow, man! Your dedication is inspiring! I guess i can contemplate my party now. Thanks!:D

Hehe, thank you. :D I always pay big attention to details so I was disappointed when I couldn't find this info in manual - that motivated me to gather all that information. Now I have even more (numeric tables for every attribute) but I do not know how to post them here because it will need to have monospace font on forum for table to look good... :(Thanks - it is the same for me. It is the first "new" game I am buying since long long time. I really hope that my ancient PC will be able to run that - it passed hardware test but it has single core CPU and 256MB graphics memory - both below minimum.You will need to move whole party behind enemy to activate this skill.
As heavy duty fan of dungeon crawlers I have plan to beat the game with only one character - it was one of the reasons to find out all these info above.

To answer your question: no, you can not probably start the game with less than four characters but gained experience is only divided on characters who deals damage - so I can let 3 characters die at start of the game and continue forward with only one - this single hero should gain all experience points during whole way = he/she will be four times stronger than average member of team when playing with four of them.

Here is my initial plan for this character:

Class: Rogue
Why not Fighter? I will probably try to evade most melee fights so weapon masteries can be useless for most of the time.
Why not Mage? Mage without Energy could become easy target (well, I do not know all spells yet, so it's still an option to try in future)

Race: Lizardman
Why not Human? Dexterity bonus on Lizardman is more important than Willpower penalty.
Why not Minotaur? Dexterity penalty.
Why not Insectoid? Vitality penalty, also I do not need Willpower bonus.

Traits:
Agile (Dexterity +2)
Skilled (+3 Skillpoints)

Skills:
Assassination: 4 (Strength +1)
Dodge: 2 (Evasion +5)

Attributes:
Strength: 11
Dexterity: 20
Vitality: 14
Willpower: 9

Health: 55
Energy: 47

Attack Power: 1
Accuracy: 10
Protection: 0
Evasion: 23
Resist Fire: 30
Resist Cold: 8
Resist Poison: 8
Resist Shock: 30

Max Load: 48kg

As I couldn't find a way to properly post table inside post I've added attachment with it to first post.

Why not include your tables and the information you placed here on the Wikipedia page for LoG? http://en.wikipedia.org/wiki/Legend_of_Grimrock

I think this information is too detailed to place it on general wiki. Any specialized LoG-wiki would be much better place.

Nice one :D

Can't wait to get my hands on the character generator ^^