We started at level 4, and leveled up to 6.
The party was hanging on for dear life as the crazed owlbear tore through the vines and brush. It clawed it's way into the room, past the two unconscious adventurers. Hodor and Varis were on the edge of death and it looked like their dragonborn companion would not be able to stop the fury of the owlbear. She seemed to be getting tired, and her spells were getting weaker, but just then she summoned all of her last energy into one final blow and the beast was slain.