Ok, so, we've all heard of the whole 'Ghost King Danny finds out about the Lazarus Pits and fixes/takes them away/wtv' thing by now, but, and hear me out, what if he* is the reason they exist in the first place instead?
So, this can go a few ways.
1. Closet juice - There was that prompt a while ago saying the Pits are like ghost alcohol, so what if the pits are Danny's version of when kids leave juice hidden away to ferment and make alcohol after learning about how wine is made and forgetting about them?
2. Portal boy - There's this headcanon that Danny is the reason the portal stabilised in the first place. Whether it is because it needed a sacrifice, or someone to assign as the portal spirit, or like one fic i read a while ago said where the portal was *his* and kind of somehow lived inside him?
So, this isn't Danny's fault per se, but what if when a Halfa is ended while their portal (natural one) is open, it created a rip in the fabric of reality leading to the place it was connecting to? In that case, when the commonly mentioned purge of Halfa's by Pariah (Blood King?) was done, it left all these rifts to slowly create pits?
You can chose a reason why, (probably Clockwork) but Danny could be going around trying to fix those rifts in one way or another.
3. Lock breaker - This is approaching crack levels, but what if because Danny isn't a normal ghost/not a Halfa created from a natural portal when he goes through natural portals he essentially leaves the hypothetical door ajar and the not-fully-closed-portals drip and create pits?
I would try to think of more, but it's late and here's your word vomit/lh, hope you enjoy
