Variable Level DiseasePsychic Parasites

What begins as a faint buzzing in your ears intensifies until you can no longer concentrate on what is going on around you.

Stage 0: The target recovers from the disease.
Stage 1: While affected by stage 1, the target takes a -2 penalty to Insight checks and Perception checks. If the target has the Psionic Augmentation class feature, it regains 1 less power point after a short rest, though not after an extended rest.
Stage 2: While affected by stage 2, the target takes a -5 penalty to knowledge checks, monster knowledge checks, Insight checks, and Perception checks. If the target has the Psionic Augmentation class feature, it cannot regain power points by taking a short rest.
Stage 3: While affected by stage 3, the target is unconscious and cannot be awakened.
Check: At the end of each extended rest, the target makes an Endurance check if it is at stage 1 or 2.
Lower than Easy DC: The stage of the disease increases by one.
Easy DC: No Change
Moderate DC: The stage of the disease decreases by one.

Published in The Book of Vile Darkness, page(s) 2-34.