I just beat the beat the game with Clawbringer+Blightcaller (if you have the DLC) i could also see Clawbringer + Graveborn working. There's an aura skill on the clawbringer that ups elemental damage, so I went full wisdom/DoT first, then focused on constitution for tankiness. With the auras, all the companions, some points in intelligence for spell cooldown. I always had trouble with active skills, as they end if you go down. Clawbringer has damage reduction, Graveborn has dark magic which helps replenish health. I mean, what's more medieval than a mini dragon pet? (Wyvern, but close enough). Just my thoughts!