sep 10, 2019 - Too much pressure
Mefune has been slowly deteriorating since he accepted the new power. He snaps a couple of times, and on the last one, he almost takes someone's aura. (Bracken? Ila? Who?) When he snaps out of it, he flees, refusing to stay around them any longer. He doesn't want to hurt them.
Added to timeline:
Auric Chronicles timeline
The basic timeline of the series