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Message: <blockquote data-quote="T. Foster" data-source="post: 3018514" data-attributes="member: 16574">Sure, it's a shorthand reference to the DMG pp. 74-75 tables just like the original use of THAC0, only without the "repeated 20s" anomaly for 0-levels, low level magic-users and thieves, and monsters with less than 1-1 HD -- a 1st level cleric and a kobold technically both have a THAC0 of 20, but the cleric's THAC10 is 10 whereas the kobold's THAC10 is 11.If you wanted to use THAC10 as a formula like THAC0, you'd subtract the target's AC from 10 and add that number to the attacker's THAC10 -- so a creature with THAC10 of 5 attempting to hit AC 4 needs a (10-4=6+5=)11; attempting to hit AC -3 he needs a (10+3=13+5=)18. Just remember when the result is over 20 that 21-25=20, 26=21, etc. So a creature with THAC10 8 attacking attempting to hit AC -6 would need a (10+6=16+8=24=)20.</blockquote>