Stay out of his way and he’ll stick to just 2 attacks until his HP gauge is whittled down to half. Gear up using anything that provides defence against lightning as that’s pretty much what the boss will use against you for the majority of the battle. To fulfil the bonus requirement for this encounter, you’ll need to use a lightning-based weapon to kill the Annihilator. Lay the Annihilator boss down to sleep and claim the Lightning Hammer.
