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In the Dungeons & Dragons fantasy role-playing game, the phasm is an aberration.

Publication history[edit]

The phasm appeared in the third edition Monster Manual (2000),[1] and in the 3.5 revised Monster Manual (2003).


A phasm resembles an amorphous blob of giant, brightly colored cells, organs, bacteria and ocean plants, roughly 5 feet in diameter and 2 feet tall, but can assume the form of almost any object or creature by using their innards as a cast. (The creature may be a bizarre form of life which has developed its organ system and cells, but has yet to obtain a permanent outer form.) It lives in underground caves.

The phasm, though classified as an aberration, has similar habits to an ooze when in normal form. When harassed or pursued, however, it morphs and develops the form of the deadliest creature it knows, and then attacks in whatever way it can in that form. When in natural form, it can attack with a pseudopod. The phasm is highly valued for various medical reasons and for study.

Phasms can speak Common, but prefer to communicate telepathically.

They are chaotic neutral in alignment.

Powers and abilities[edit]

The phasm is a shapechanger, able to assume the form of any corporeal creature. It can also communicate telepathically.