You need magic weapons, as I believe he's either immune to non-magical damage or has high damage resistance to it. Fire damage would help as well.

At this point in the game, you should have either found a few magical weapons of +1 enchantment or have enough gold to buy a couple. Even if your fighters aren't proficient ion the magic weapons you've got, use them anyway for this battle.

Thanks for the advice. I haven't really found too many magic weapons. A lot of white +X damage and THAC0. I try to be thorough. I have about 2600 gold. I'm a giant noob at these types of games.

I seem to be wasting too much money on identifying magic items. Would buying an identify spell be worthwhile?

If you lack magic weapons, try the Spiritual Hammer spell for your cleric(s). It works as at temporary magic hammer and can even (unless I'm mixing up games) be thrown.

Absolutely. You can gather up some items, have your mage fill his slots with Identify, then rest and ID all your items. Rinse and repeat until they're all IDed. Then fill his slots back with his offense/buffs spells and go back to dungeon crawling.

Of course, this makes more in-game time pass, but that's not a big issue.

The forum appears to have eaten my post. I'm still learning the ropes with this forum technology. I'm not sure if there's some sort of delay or if it's permanently gone.

Basically, if my other post doesn't come back, here's what I said:

Thanks for the suggestions, I'll try them out. I don't have a mage because I followed a build guide that has my thief dual-ing over to mage at like, level 12. My ranger already dualed over to cleric so he's my only spellcaster right now.

Would named weapons count as magic, or do they have to be blue? I stole Conlan's hammer. I am trying to recall any other blue/named weapons I have.

No offensive spell casters? You're going to have a hard time.

My party consisted of a
Dwarf Fighter
Dwarf Fighter / Thief
Half-Elf Bard
Human Fighter / Cleric (dualed when fighter level was 5)
Human Druid
Elf Diviner

Had no problems whatsoever. Druid casts a lot of Entangles and Spike Traps (if they were called that), Diviner threw Fireballs or Snowball Swarms, depending on the enemy, Bard sang his songs and threw an occasional Haste/Flame arrow/Chromatic orb. The rest specialized in one weapon. I suggest you get an offensive spellcaster.

Yes, I read online that people were having an OK time just with melee fighters and then dualing/multiclassing them over to mage/cleric/druid later on. It gave them a boost to hit points and helped out with survivability. I've been doing well so far, although that other mummy on the other side was kind of a jerk too.

I have to look, I probably have magic weapons and I've been holding off. Or maybe holding off on identifying some of them.

So basically, I've gotten to the point where I can defeat him (after like 10 minutes) but a few of my guys are diseased. But on the bottom it says they're "poisoned". I tried drinking an antidote and that didn't work. I assume mummy's tea works better.

I am holding off on bringing a 6th party member because I worry about the decrease in distribution of experience among my members. I am somewhat close to leveling over to mage on my thief.

I have (I'm drawing from memory):

Paladin leader
Fighter > Druid dual class
Ranger > Cleric dual class
Thief > Mage (will dual class)
Fighter/Thief multiclass

Anyway, thank you all for the advice. I'll probably be back for more down the line.

I assume we're talking about the immortal lich here? You know you're not supposed to beat him in a regular manner, don't you? The friendly undead (forgot his name) tells you what to do. If you beat him in the regular way, he will just come back up again and summon more minions. It's the same lich in the room with many tombs.

Interesting. I don't recall the immortal lich. I'm on the first level of the tomb.

http://mikesrpgcenter.com/icewind/maps/ar3501.html

I'm at location T7 on the map. The game calls him a mummy, and he guards the mausoleum key. There's also a nice loot chest by him with a mage's robes and a couple other nice things. If I defeat him I can go down the ramp and hopefully get to the second level.

Oh, ohhhh...Sorry. completely my bad. My memory played a jest on me and I got the names of the places mixed up. An immortal lich only comes later on. Spoilers!

Truly, I'm very sorry. But in either case, you really should focus on getting your party more magic-oriented. It will be a necessity especially later on. I know there would've been many occasions where continuing would have become really hard, if I didn't have people who could throw Entangles and AoE damage-dealing spells.

edit: Also, I remember the mummy over there giving me some problems as well. I didn't have that many offensive spells acquired yet. The way I did it, was first blast him with all my damaging spells, and when they ran out, the bard shot +1 arrows at him until he died.

Ha, well, it's OK. The way I play games, an hour or so every few weeks, most games' stories get lost on me. I'll probably forget anything about a lich the next time I play.

I'm going to try to level up my thief one or two more levels. Then, when he duals it should be pretty fast to level my mage up. And I have like, 40 different magic scrolls saved up too.

Getting into these games, having never played these types of games when they came out, is a beast. The concept of not having mana but rather having to remember magic spells was hard to wrap my head around at first.

Thanks again. I'll be back I'm sure. I'm trying to make my way through most of these guys. I'm playing IWD and Baldur's gate sort of simultaneously, then going on from there.

Status update.

I checked, and most of my guys had some sort of blue, +1 damage/+1 THAC0 weapon. I equipped everyone with the blue weapons. My THAC0 went to garbage on some people.

I had to reload the save like 4 times, but he finally went down with no one diseased or dead. What a fight!

The thing that gets me is that on the status bar, even with magic +1 weapons, it still said the mummy resisted most of my damage.

yeah, I believe he's resistant to certain damage types (slashing?). Can't recall what type(s) offhand. Re the disease: yeah, Mummy's Tea. That takes care of it right away.

Anyway, good to hear you took that bugger down! Now get some casting power and you're going to rock.

Yeah, I remember now that mummies (and skeletons) only take full damage from blunt weapons. So swords, axes and missile weapons are not very effective, but maces and hammers are. Another reason the Spirtiual Hammer spell is nice to have. I think you also get a +1 or +2 Mace from defeating the Priestess of Auril.
In the Gold Box and IE games I always carry around some backup blunt weapons just in case I run into skeletons or mummies. Liches also take half damage from sharp weapons in some of the games.