Level 11 DiseaseMistwatch Blight

Black ichor splotches your skin, spiderwebbing across your body until you feel something inside you begin to die.

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. The target also loses a healing surge that cannot be regained until cured of the disease.
Stage 2: While affected by stage 2, same effect as stage 1, and the target is weakened until cured.
Stage 3: When affected by stage 3, the target dies. The next day, at sunset, the target rises as an undead creature. Most victims rise as zombies, but more powerful ones can rise as ghouls, wights, or wraiths.
Check: At the end of each extended rest, the target makes an Endurance check if it is at stage 1 or 2.
12 or lower: The stage of the disease increases by one.
13-18: No Change
19 or higher: The stage of the disease decreases by one.

Published in Dungeon Magazine 186.