Grey Ooze

Slimy horrors that lurk on stone surfaces or among boulders.

AC8 [11], HD3* (13hp),
Att 1 × touch (2d8), THACO 17 [+2],
MV 10’ (3’), SV D12 W13 P14 B15 S16 (2),
ML 12, AL Neutral, XP 50, NA 1 (1),

• Blend in with stone: Difficult to tell apart from wet stone.
• Acid: After a successful attack, sticks to the victim and exudes acid. The acid destroys normal armour immediately and inflicts 2d8 damage per round. (Magic armour is dissolved in one turn.)
• Energy immunity: Unharmed by cold or fire.

Source: Classic Fantasy