Board Thread:Theories Discussion/@comment-4188031-20130916124113/@comment-12376798-20130917003058

I personally think it was all the HER. At first, it's the HER making him hallucinate that Elluka's asking him to take her to the temple to reincarnate her, promising they could stay together, and it just gradually gets ruder and ruder, to the point where "she" calls him an idiot. Getting more impatient, running out of time. It's either just his mental state deteriorating, or it's Levia and Behemo, as Octo said.