Grey Ooze

Slimy horrors that lurk on stone surfaces or among boulders

Type: Ooze

Stat Blocks

Old-School Essentials Classic Fantasy

Armor Class	8 [11]
Hit Dice	3* (13hp)
Number Appearing	1 (1)
Attacks	1 × touch (2d8)
THAC0	17 [+2]
Movement	10' (3')
Saving Throws	D12 W13 P14 B15 S16 (2)
Morale	12
Alignment	Neutral
XP	50
Treasure Type	None

Monster statistics extracted from online SRD wiki, not the published hardcover edition.

Slimy horrors that lurk on stone surfaces or among boulders.

Special Abilities

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.

OSRIC

Armor Class	8
Hit Dice	3+3
Number Encountered	1d3
Attacks	1
Damage	2d8
Move	10-ft
Alignment	Neutral
Intelligence	Animal
XP	4/75+3/hp
Treasure Type	None
Size	Medium to Large
Frequency	Rare
Lair	Nil

Monster statistics extracted from online SRD wiki, not the published hardcover edition.

Grey ooze is indistinguishable from wet stone until it attacks. It will form tentacles that lash out at any who pass. It is corrosive and will eat through chain in 1 round, 2 rounds to eat through plate. It will not damage wood or stone. Magic involving heat or cold does not harm grey ooze but lightning will. Grey ooze also takes full damage from normal weapons, but if the weapon is made of metal it too will begin to dissolve.

As it matures grey ooze gets larger. Specimens over 20 HP can be as large as 36 square-ft. While they cover a huge area they are never more then a few inches deep. At larger sizes they begin to form a kind of consciousness.