Role-playing Games Stack Exchange is a question and answer site for gamemasters and players of tabletop, paper-and-pencil role-playing games. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I play a mix of AD&D 2ed and 1ed and I need to know if monsters are supposed to have THAC0. I can't find the monster THAC0 chart anywhere. I only have the 1978 edition of the Monster Manual. My friend showed me how to start a dungeon but he forgot to tell me about THAC0.

share|improve this question

Yes, Second Edition monsters have THAC0. The Second Edition monster books were first the Monstrous Compendiums (looseleaf binders) and then later the Monstrous Manuals (hardbound).

AD&D Second Edition came out in 1989. You appear to be looking at First Edition AD&D monster books (Monster Manual, Monster Manual II, Fiend Folio). These do not have THAC0. It is reasonably easy to give these THAC0s, of course - you take what they need to hit armor class 0 off the 1e DMG table on p.75 and that's the base THAC0. 1-1=20, 1=19 1+=18,2-3+=16,4-5+=15,6-7+=13, etc. Modify by strength.

share|improve this answer

As far as I can remember the individual monster sheets in the Monstrous Manuals had THAC0s, since the monster needed that stat as well. (It was printed right after the monster's Hit Dice and before its No. of Attacks.)

share|improve this answer


I've got you covered! Go to page 196 of your DMG (1st Edition, that is) and look at the third column of the monster descriptions -- it says "To Hit A. C. 0".

Have fun playing!

share|improve this answer

Use the Combat Tables on Pgs. 74-75 of the 1979 Edition DM Guide. Your AC and level determine your Base THAC0 on these charts. Think of it like the game Battleship. AC across the top and your Level on the left side of the chart. For example, If I'm Level 2 thief with a Armor Class (AC) 5, my Base THAC0 would be 17. If I'm fighting a giant ant with an AC3, I would have to roll a 14 or better on a 20 sided die for an effective hit. (Ant's AC, minus my Base THAC0 = effective hit.) Good luck!

share|improve this answer
This is about monsters, not PCs. Your advice is close to right, but inaccurate, because you're talking about the wrong chart. – SevenSidedDie Aug 26 '14 at 0:02

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.