In the distant past the Coalition changed everything, after a grief ridden Necromancer lost the only thing he loves, his daughter, he sought-after all neceomatic spells that could reverse her fate, years after his daughter died he finally got all the ingredients but after completing the spell the gods punished the necromancer for tampering with fate, they killed him and wiped his daughters memory in turn they accidentally created a black hole that sucked in all the realms into one including the Nine Hells now reside in a part of the Underdark, letting Tiamat free from her eternal imprisonment