Any Rift hero suggestion? pair with mav gauntlet

my heroes:

All Epic

Legendary: Millicent Lv35; Vordrai Lv45; Kamil Lv30; Lukin Lv19;

Unique: Azhar Lv40; Mikazuki Lv30; Urmas Lv30; Macleod Lv17;

Currently using Azhar&Vordrai but some boss fights were so hard for me(boss apply protect&fury&focus to himself and his skill does tons of dmg), I'm thinking about raising Olaf&Grimm to Lv45(my level is 51).