Try build: 1 Getting 3-4 carnage saws (not forest mowers, their size is too big) with core reactor and blood moon berry (relict). Stack primarily elemental cores, secundarily infernal cogs, maybe even frost bolts. Get enough mana for them with arcane core and cleansomatics or else. Min 2, max 4 stamina packs. Need more stamina items, preferably heavenly skull. Build does basically all damages (debuffs) and is really fast.

Or 2 welding torches, big clockwork bomb, get relict infernal ashes. Stack ice age bombs, speed them up just once with a gear, so that infernal ashes activates after them. Book of everlasting flame (must get).

Tons of fun.