Campaign: Dungeons of Drakkenheim
Researching the Spell: A character who can cast 3rd level spells can research Purge Contamination. To complete the research, the caster must spend 6 days of downtime and 300 gp.

You apply alchemical fluids or holy water to a contaminated humanoid creature while reciting an exacting magical chant that expels eldritch contaminants from the target’s body. When you finish casting the spell, all contamination levels and mutations are removed from the creature. It then gains one level of exhaustion for each contamination level removed with this spell.