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...How much I love this manga. So here are my screams...
AAAAAAAAAAAHHHHH AAHHHHHHHHHH
AHHHHHHHHHHHHHH
AHHHHHHHHHHHH AHHHHHHHH
AAAAAAAAAAAAAAAAHHHHHHHHHHHHH
... it was MC's family the one that tortured or tried to kill one of ML's personalities. Wanting revenge, he must have freed and fusioned with the God, maybe trapping a couple of people in the process.
They want a sacrifice from MC's family as punisment for that torture. The revenge is what made this happen, even if other personalities wished for forgiveness, they must share the pain and treason from the moment they became one.