This is a green monster build just use high fire rate weapons. A green monster with 3 or 4 in rpm and a fire rate bonus. Pearl and old god with bonus corrosive damage. M10 just try to reroll so you don't have corrosive immune enemies. Cloning maddening tracker is the best grenade that's your heals. Your gonna wipe out any enemy fast and everything is going to get that corrosive buff from iron bear to grenades.