@Nen-suer
Humm? why not? I always defeat all bosses in each of the world to get PW, then I suicide myself enough times to get PB, and once you defeat the Black Phantom NPC (Satsuki for example) and the Primeaval Demon, you get PW once mor.
The Primeaval demon looks like a giant white slug that doesn't attack you and stays still even when you're killing it.
On world 4, it's located on the hidden passageway were you fought that Black Skeleton, to the left of it, there's a ledge with the Primeaval Demon, but you need to be in PB WT in order for it to appear.
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