D20:Psionic Subtype Creature Subtype

Any creature with psionic powers has the psionic subtype. A psionic creature can be born with the subtype or can gain the subtype during its life.
A creature meeting any one of the following criteria has the psionic subtype:

• Creatures with a power point reserve, including characters who have levels in a character class that grants them a power point reserve or creatures who have the Wild Talent feat.
  
• Creatures with psi-like abilities, including characters who have racial psi-like abilities.
  
• Creatures that have spell-like abilities described as ?psionics.?
  

Other than the fact that all psionic creatures have psionic powers, power points, or psi-like abilities, psionic creatures have no specific traits. The psionic subtype serves to identify 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-mindaffecting powers or effects that specifically affect psionic creatures.
Intelligent constructs and plants with psionic powers or psi-like abilities also share this advantage.

Some creatures have feats that can be used only when the creature is psionically focused, or that require the creature to expend its psionic focus. Assume that such a creature is psionically focused before entering combat.

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System Reference Document -> Creature Types (SRD)