Amorph

Amorphic creatures (also commonly referred to as amorphs) are mutable in form, and do not always have a defined shape of their own. They are sub-divided into incorporeal gases, mimics, and slimes. All amorphs can slow, corrode, burn, or poison.

Incorporeal
Incorporeal amorphs are the rarest and most dangerous type, due to their ability to quickly permeate and encompass their prey. They are different from ghosts in that ghosts are formerly corporeal beings that have not completely phased out of our plane.
 * Corrosive Stratus
 * Dark Nimbus
 * Shadow Cirrus
 * Funk Cumulus
 * Vile Miasma

Mimic
Mimics were originally created by wizards as theft deterrents against treasure hunters. They camouflage themselves into innocuous solid forms and lure in their prey. Once triggered, they revert into an amorphous mass that can absorb its prey or harden parts of its body as needed for offense or defense.
 * Polter Barrel
 * Polter Book
 * Polter Box
 * Polter Chair
 * Polter Chest
 * Polter Pot
 * Polter Vase

Slime
Lowly life forms of minimal intelligence, made from condensed elemental energy. Many unwary travelers have fallen trap to a slime that has stretched over a pit or fallen from the ceiling. Many slimes dwell underground, and possess a sense that allows them to feel vibrations, discerning nearby objects and creatures without needing to see them.
 * Ancient Ooze
 * Caustic Jelly
 * Cave Slime
 * Fiery Jelly
 * Giant Amoeba
 * Grey Goo
 * Toxic Sludge
 * Slick Jelly
 * Swamp Muck
 * Viscous Slush

Notable Amorphs

 * Blob and Glob