The psionic subtype applies to creatures that can use psionic powers or abilities or that have the ability to manifest powers. (In other words, a creature with the psionic subtype either has a power point reserve or has psi-like abilities.) It also applies to creatures from other sources that have spell-like abilities labeled as “psionics.”
Characters who have levels in any class that grants the use of psionics, or who have psi-like abilities as racial traits, gain the psionic subtype.
Traits: Other than the fact that all psionic creatures have psionic powers or psi-like abilities, psionic creatures have no specific traits. The psionic subtype simply identifies creatures that may be vulnerable to powers, spells, and effects targeting psionic creatures.
A psionic undead creature, although rare, is a force to be reckoned with.
Because undead are immune to mind-affecting effects (including charms and compulsions), they are particularly threatening to other psionic creatures and characters (especially telepaths). Psionic undead creatures can use mind-affecting powers on the living, even though they themselves are immune to such attacks. However, an undead creature may have the psionic subtype if it meets the criteria described above, and thus be vulnerable to non-mind-affecting powers or effects that specifically affect psionic creatures. Intelligent constructs and plants with psionic powers or psi-like abilities also share this advantage.
Psionics Unleashed. Copyright 2010, Dreamscarred Press.