Whimsical said:The SRD says "You can move through a square occupied by a helpless opponent without penalty. (Some creatures, particularly very large ones, may present an obstacle even when helpless. In such cases, each square you move through counts as 2 squares.)"
From that I only have Huge or greater sized creatures make difficult terrain when they are defeated.
The SRD also says about Crowds "It takes 2 squares of movement to enter a square with crowds."
The DMG II, pg. 59 says "As a general rule, a single 5-foot square ocupied by a crowd of Medium creatures contain three Medium creatures."
From all of this, I would extrapolate that a square would need at least three Medium corpses to make it difficult terrain.
I agree. In our games, we mark where corpses fall, and that square is difficult terrain. Remember, in many cases you're talking about more than just a body: there's slick blood, fallen equipment, maybe even loops of entrails. Yep, definitely one D&D corpse is enough to make a square difficult to move through.Hairfoot said:In the heat of battle, I'd say just one medium size body in a five-foot square area is enough to be difficult terrain.
Thirded.Hairfoot said:In the heat of battle, I'd say just one medium size body in a five-foot square area is enough to be difficult terrain.

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