You are having a hard time inflicting any damage on DMMK, who is shielded by his strong gravitational field. It seems to be absorbing everything you throw at it, including lashes of paint and scalding flames.
Hey check it out. Every week we'll be revealing some new troll characters from Hiveswap until Act 2 is out. Follow the Troll Call here, and meet the first two here. Expect a few more surprises like this to drop in coming weeks.