Trying to come up with some further backstory for space clowns in the Spelljammer game I'm running. According to their monster entry, they were corrupted by drinking an elixir that contained demon ichor, which they became addicted to and eventually turned them into cannibalistic fiends who travel the stars, searching for humanoid flesh to consume. Are there any particular demon lords that would be fitting as the one behind this plot to corrupt these people who originally had a religion of happiness and joy? Which demon lord corruption would lead to insanity and cannibalistic tendencies?

I've been running a Spelljammer game recently, and have been throwing various different enemies at my players to see which ones they're most interested in, or which ones they're the most afraid to fight. So far, they've told me the encounters that have stuck with them the most have been against space clowns. I want to use them more in my game.

What are some fun encounter ideas for these fiendish clowns?