That's very clever to use Fey Illumination instead of the AE heal, I hadn't thought of that. I'll definitely adjust my strategy accordingly...

I think Selene is useful for clearing trash - at least, more useful than Eos is. I'm only level 42, but at least in the dungeons I've run so far, I don't seem to need the AE heal for the trash fights, and I hate to have Eos just sitting there only using Embrace.