Posted April 14, 2015
On the fly info dump for those interested -
When you play games like Baldur's Gate or Icewind 1, you will see a stat called THAC0.
It's short for "To Hit AC 0".
In those games, the lower your AC can be, the better. It's more than a little unintuitive, considering that games are typically always about bigger being better. But it's the opposite in this case.
A level 1 character with no Dexterity bonuses, no armor, and no magical bits that provide protection will have an AC of 10.
Against a very low-level monster who has a THAC0 of 20, this will give them a 50 percent chance of hitting you. ( THAC0 20- AC 10 = 10. Since to-hit rolls are done with a 20-sided die, that's a 50 percent chance that the little ankle biter will manage to harm you.)
At the same time, if you take a level 20 character with magical armor, bonuses, a nice big shield and some protective spells to boot, they could have an Armor Class (AC) or -10, or possibly even lower if you have enough spells stacked on. (One of many reasons why keeping a cleric around is fairly crucial for survival, they are the masters of things that will keep you alive while others want to butcher you.).
Take that high-end character, put them against that same low-level monster, and suddenly the monster's probability of a hit plummets. (THAC0 20 minus -10 = 30. With a 20-sided die being the standard for all rolls to hit, that gives them the lowest chance possible, at 5 percent. They have to roll a natural 20 in order to do the high-end character any harm at all.)
You always, always, always want both your THAC0 and your AC to be as low as possible. The lower the THAC0, the better your chance to hit, the lower your AC, the worst chance an enemy has of hitting you.
(When you see a dragon that has a THAC0 of 1? Either be ready to kill it fast, or be ready to run. Otherwise, it will splatter you all over the walls, high-end characters or not.)
When you play games like Baldur's Gate or Icewind 1, you will see a stat called THAC0.
It's short for "To Hit AC 0".
In those games, the lower your AC can be, the better. It's more than a little unintuitive, considering that games are typically always about bigger being better. But it's the opposite in this case.
A level 1 character with no Dexterity bonuses, no armor, and no magical bits that provide protection will have an AC of 10.
Against a very low-level monster who has a THAC0 of 20, this will give them a 50 percent chance of hitting you. ( THAC0 20- AC 10 = 10. Since to-hit rolls are done with a 20-sided die, that's a 50 percent chance that the little ankle biter will manage to harm you.)
At the same time, if you take a level 20 character with magical armor, bonuses, a nice big shield and some protective spells to boot, they could have an Armor Class (AC) or -10, or possibly even lower if you have enough spells stacked on. (One of many reasons why keeping a cleric around is fairly crucial for survival, they are the masters of things that will keep you alive while others want to butcher you.).
Take that high-end character, put them against that same low-level monster, and suddenly the monster's probability of a hit plummets. (THAC0 20 minus -10 = 30. With a 20-sided die being the standard for all rolls to hit, that gives them the lowest chance possible, at 5 percent. They have to roll a natural 20 in order to do the high-end character any harm at all.)
You always, always, always want both your THAC0 and your AC to be as low as possible. The lower the THAC0, the better your chance to hit, the lower your AC, the worst chance an enemy has of hitting you.
(When you see a dragon that has a THAC0 of 1? Either be ready to kill it fast, or be ready to run. Otherwise, it will splatter you all over the walls, high-end characters or not.)
Post edited April 14, 2015 by CarrionCrow