So…Just have curses be permanent? Why?

It’s a thing about Law, specifically the realm of Law, Mechanus, who’s power I would guess they carry with them.

One of the (I think optional in 5e) realm rules for Mechanus is you do not make attack rolls. Instead, you treat any roll as a 10 and add your stat and proficiency as the realm removes the idea of random chance and focuses on clockwork regularity. Even damage die default to their average, which makes combat a lot more straight forward but also means you can come up on something you literally cannot hurt.

There’s a handy common level magic item in Xanathar’s Guide, called the Clockwork Amulet, which let’s you skip an attack roll and just take it as a ten, and do so once per day (No attunement, resets at sunrise). It’s a good thing in certain situations

He rose to godhood a century ago using six magical crystal gems, and in doing so both felled an Orc god and an evil Orc champion, the foul Ho’Gann

I remember a point where Magneto trapped Red Skull in a metal bunker underground with just bare minimum supplies then sealed the place

He’ll one day be a lord, and institute the CHEESE TAX

Well at this point, my Warlock has an enemy for almost each season, them being an Eladrin

Spring has this situation, where some servant of the archdevil knows her face

Summer has a Lich Queen who has his portrait from a ghost who saw him during a heist of her library

Autumn’s issue is she trapped a Dracolich in the astral sea with no way back on her own

Winter is the only one sitting pretty, with the only big name attached to his face being that the Winter Queen adores him as much as she does all children of winter

Wait until the players become the crew of the Red Dwarf