Aquae Sucellus removes the disease promotion, but not the plague. Moving onto the tile of The Pool of Tears is the only vanilla FfH solution for removing the Plague from a magic immune unit (short of worldbuilder).
Hmmm, never thought of Acheron as an animal. I captured him in my current game as well. Stepanos spawned in my lands and I managed to kill him by swarming him with all the garrison troops from nearby cities. That was fairly early in the game and since then I've been using the Crown of Command to collect far more units (including Acheron) than I've had to produce on my own.
Acheron is not an animal, but a Beast. Subdue Animal is useless against him, while Subdue Beasts guarantees you'll capture instead of kill him (unless the unit is also hidden nationality).
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