After some serious leveling, I managed to get through the last 3 segments of the shrina building in one shot. Landed a dark attack on rufus on my first attempt and quickly beat the shit out of the dog, but even with him blind, he was still hitting my party like crazy. I was long since out of heals and it came down to the wire to be sure. Everyone is around 27/28 with mostly 3 or 4 star gear, but Rydia with her shitty 2 star beret almost got one hit KO'd by a shotgun crit. Her HP is 1309 and she took 1267 O.O
I will never get that protect ring though, so moving onto the next event is best.
Edit: someone mentioned they got a summon orb off rufus, so did I. I checked the orb list and you can't farm any summon orbs? I guess thats a pretty good drop then.