JKSManga
I just wanna point out that even though they've already had planet destroying/shaking fights that Quinn just did something a little different. this is a planet that is essentially made for demon tier beast so its stronger than most planets. and this man just slammed Erin shard that he shook the planet. the man is going for blood right off the bat and he's about mess her up
I think Erin is brain washed, and I think I know who might have done it, does not excuse killing all of those vampires and Leo but would explain it, she seems to have a hate for vampires even though she is said to resist the urge to kill them. I think it was Bliss, she is always planning ahead to save humanity , even if it means sacrificing thousands of lives. She said Erin would be useful against immortui, so she could have been building her up to fight him.