Victim said:Yes. Look at some oozes.
Charwoman Gene said:Can anything wind up with a negative AC?
Also Size Colossal Advanced Oozes with 1 Dex and no natural armour easily make it:Hypersmurf said:Easy. Take any Huge creature with no natural armor bonus, and knock it out.
AC against melee attacks:
10
-2 (Size)
-5 (Effective Dex of 0)
-4 (Prone)
Total: -1.
-Hyp.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.