Level 21 DiseaseHellfever

Those who suffer from hellfever complain of alternating sensations of searing fire and freezing cold.

Stage 0: The target recovers from the disease.
Stage 1: The initial effect’s penalty becomes -1.
Stage 2: Initial Effect: The target takes a -2 penalty to attacks and checks until cured.
Stage 3: The target is weakened.
Stage 4: Final State: The target is dazed.
Check: At the end of each extended rest, the target makes an Endurance check if it is at stage 1, 2, or 3.
22 or lower: The stage of the disease increases by one.
23-27: No Change
28 or higher: The stage of the disease decreases by one.

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