MC Exp = Lazarus Water
Skulk Catalyst ends up in the pits of Ra's place and/or wherever else ya want and all hell breaks loose because invasive species in the LOA Base of the literall bossman
(for any readers confused, check the minecraft.wiki 's pages on Skulk Catalyst and The Warden)
((If you want you can make this D.P. as well and make it so Exp = Pit Juice = Ecto which as a whole 'nother layer to the madness))
I am vibrating, because I absolutely adore this whole idea. The chaos. The body horror. The Potential for how it could all go. Even more chaos? The whole trope of portals opening up in the Pits, but lets make it to Every Pit suddenly having a catalyst. It's not just Nanda Parbat, but there's suddenly sculk in the Alps, the Himalayas, Infinity Islands, Gotham- It's in a lot of places. And it's spreading.
Forget zombie and vampire apocalypses, it's going to be like the Quiet Place but worrying about vibrations and scent as well as sound.
And if Ectoplasm equals the same, well. I wonder if perhaps that is what forms the Wardens. Souls trapped inside, like malformed remains of cores as bodies are twisted apart into something new.