Level 23 DiseaseSlimy Doom

Abyssal parasites devour the internal organs of the victims, turning them into quivering slime.

Stage 0: The target recovers from the disease.
Stage 1: The target regains one of its lost healing surges. The target loses this healing surge again if its condition worsens.
Stage 2: Initial Effect: The target loses two healing surges until cured.
Stage 3: Each time the target becomes bloodied, it takes ongoing 10 necrotic damage (save ends). If this damage reduces the target to 0 hit points, it turns into infectious slime from the inside out, dying horribly.
Stage 4: Final State: At the moment of the failed Endurance check and each time the target takes damage, the character takes ongoing 30 necrotic damage (save ends). If this damage reduces the character to 0 hit points, it turns into infectious slime from the inside out, dying horribly.
Check: At the end of each extended rest, the target makes an Endurance check if it is at stage 1, 2, or 3.
24 or lower: The stage of the disease increases by one.
25-29: No Change
30 or higher: The stage of the disease decreases by one.

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