basically, the subjugator that killed eris is now top 5 strongest characters in verse going by powerscaling logic
eris > xivu and savathun (banished xivu and killed savathun in season of the witch)
savathun > nezarec (killed him in the collapse) therefore eris > nezarec
xivu is the strongest hive god and eris is stronger than her
random subjugator killed eris so it is stronger than all of the above
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Not 100% sure but I saw someone say a while back that Eris used all of the hive power she obtained to remove Xivu from her throne world. So killing Eris is not really some massive thing rn. Also Savathun is weaker than Nez she's only smarter than him. In a true 1v1 she'd lose. In order to kill him she was still on his side and killed him while he wasn't paying attention to her.