Board Thread:General Discussion/@comment-26907577-20191002153041/@comment-26907577-20191029131549

I've got it.

The reason Chara goes along with the plan of killing all monsters... is because they are now SOULless.

The reincarnation the second time wasn't part of the plan, because Chara's SOUL was destroyed in the Buttercup Incident.

And without empathy or compassion... the First Human was left with a mission.

Fulfill that damn prophecy.

And, of course, Asriel did betray them. It seems vengeance isn't something you need a SOUL to have.

Consider this the Respawn Hypothesis, v1.1 patch.