FREQUENCY: Rare
FREQUENCY: Uncommon ([Dungeon Level IV])

NO. APPEARING: 1-3
ARMOR CLASS: 8
MOVE: 1"
HIT DICE: 3 + 3
% IN LAIR: Nil
TREASURE TYPE: Nil
NO. OF ATTACKS: 1 ~ 16
DAMAGE/ATTACK: 2-16
SPECIAL ATTACKS: Corrosive properties, possible psionics
SPECIAL DEFENSES: Immunity to most spells
MAGIC RESISTANCE: See below
INTELLIGENCE: Animal
ALIGNMENT: Neutral
SIZE: M to L <18hp+ = L>
PSlONlC ABILITY: 21-121
    Attack/Defense Modes: E/Nil
LEVEL/X.P. VALUE: IV | 200+5

Gray ooze is a slimy horror which inhabits subterranean places. It closely
resembles wet stone or sedimentary cave formations.

This creature corrodes metal at the same rate a black pudding (qv) does,
i.e. chainmail is eaten through in a single melee round. Its acids do no
harm to stone or wood. Spells do not harm this creature, and it is
impervious to heat or cold. Lightning, however, causes full domage to gray
ooze, as do blows from weapons. Note, however, that in the latter case the
weapons striking the creature may corrode ond break. They strike like
snakes when attacking.

Large specimens (over 18 hit points) are larger than a full grown man,
some (those over 21 hit points) are fully 3' wide and 12' long, although
only about 6 or 8 inches thick.

In exceptionally large individuals intelligence of a sort is well developed.
Furthermore, these exceptional individuals have a latent psionic ability,
and if psionic powers are used within 6" of them they will prepare a
psychic crush of from 21 to 121 psionic strength attack points and direct it at
any individual within range who uses psionic abilities. After loosing its
psionic attack the gray ooze con be psionically attacked.
 

Q: How do you determine if a weapon
striking a gray ooze corrodes?

A: Have the weapon roll a save vs. acid (see
the DMG, page 80).
(131.63)

Quote:
Originally Posted by taliesin15
Mr. Gygax:
Any thoughts on where Oozes come from? Especially Grey Ooze and Gelatinous Cubes--are these supposed to originate from the experiments of crazy evil wizards, or from Demons/Devils?

Heh...

As the chap that made up both of them, I had better have an idea as to where they came from 

My concept wasthat both were accidental creations of careless wizard alchemists that dumped various failed magical and alchemical experiments down the drain or into some cess pit.
These admixtures affected single-celled life forms, thus eventually engendering the various jellies (and a gelatinous cube is one of those), oozes, puddings.
The slimes were generated in similar fashion, the waste affecting normal slime.

Cheers,
Gary