correction, shield last for 2t.
Yes they're quite strong, but it requires 7t to cast. So i think it's still alright.
Ah, two turns. Thanks for the correction.
I think it's fine. It has many counters in PVP. I usually silence/stun or kill (if I can easily) Lucille Inquisitor before her 7th turn. If she's able to cast it, then I play the Tile-Control game instead of the kill all strategy. The best one to use are spirit walkers, chaos knights, ninjas, rune magus. Other strategy is to kill all the opponent's DPS Classes first before her shields activate so her remaining characters will be tanks/healers which are easier to defend when they attack.
In PVE, blessings of the sun is OP! Turns in PVE are longer making it very life saving skill, specially in later legendary trials.

Yeah, I'm referring to PvP. Usually I try to kill as much of the offensive heroes first, so maybe I've been neglecting her. But she becomes a real problem when my Shizu fails to crit and kills the enemies before Lucille casts her BotS. Hmm maybe I'm lacking CC.
Thanks everyone for enlightening me.