Which ooze best represents a "Grey Goo"?

[SangoProduction]

As the title says. Preferably the "acid" damage preferentially damages biological.

[Braininthejar2]

green slime in guess - you touch it it starts turning you into more of itself.

[SangoProduction]

Yeah. That works pretty well.

[Mike Miller]

Dungeonscape has a gray slime that is an environmental hazard which deals acid damage.

[MaxiDuRaritry]

Most oozes destroy themselves too fast to reproduce, since they're covered in acid they're not immune to.

Try brown mold in the Elemental Plane of Fire Brown Mold.

[Thealtruistorc]

Pathfinder has an actual Grey Goo monster in Bestiary 5. It's quite effective in my opinion.

[Psyren]

Try brown mold in the Elemental Plane of Fire Brown Mold.

Plane of Fire is infinite in size per MotP. Thus, no matter how much brown mold you get, there is an infinite amount of unaffected fire. For all we know, this has actually already happened :smalltongue:

[frogglesmash]

d20 future has literal Grey Goo, but it functions more as a hazard than a creature, it also just forces a fort save against death instead of dealing damage.

[Segev]

Chaos beast. It turns its victims into more of itself.