"Sigh... hand me my exorcism kit. Rognar has demons in his bowels again."
Then we need an archetype that's all about (im)balancing the humours, and maybe a Discworld-style retrophrenologist.
"Take this. A far superior relic to that old jelly you were chained too. Try it on for size. And, erm, it was... very nice to have met you...Terribly sorry, my friend... Ta." -- Volo, shortly before fleeing camp after performing eye surgery on you, Baldur's Gate 3