I'd have been happier if Seraph simply replaced Eos altogether. Shes not all that powerful on her own as a 2 minute cooldown.
Temperence and Neutral Sect are far more powerful than what Seraph offers for the same durations and cooldowns.

Then we'd just have Selene/Eos/Seraph options for visual effects. Would give us more opportunity to apply DPS with the mini shields going out.