Undead horde crypt boss over tuned?

[Qlex]

Am I doing something wrong or is the undead horde crypt boss in stage 7 over tuned? It litteraly one shots my entire party on the first round, got 3 level 50's and 2 40's, all in minimum 4 star, rank 12 or higher gear. None of the other factions bosses has done nearly this much damage.

[Qlex]

Just did the high elf crypt boss with Apothecary(50) and Heiress(40) easy and Heiress has alot worse gear than any of my undead faction champs.