Level 14 DiseaseShakes

This disease causes involuntary twitches and tremors that grow progressively worse.

Stage 0: The target recovers from the disease.
Stage 1: Initial Effect: The target’s speed is reduced by 1 until cured.
Stage 2: The target is slowed.
Stage 3: Final State: The target is immobilized.
Check: At the end of each extended rest, the target makes an Endurance check if it is at stage 1 or 2.
17 or lower: The stage of the disease increases by one.
18-22: No Change
23 or higher: The stage of the disease decreases by one.

Published in Dungeon Master's Guide, page(s) 50.