Bought merc and with his 1-118 light dmg, plus our combined curshing blow we managed to work him down
Always found this swam of bugs were pretty funny, especially if you are hitting them as a big bear, it was actually a purple boss that they took out of the game for some reason.
We couldn't kill him in the end, once the crushing blow wasn't working, it turned out he outhealed my merc, and even my dmg with the lightning dmg circlet... luckily the next level was in a different way otherwise would have had to create a new game.