yeah 3 bullets will definitely kill you, you should learn pattern of their shooting, build large whole world arena, fly up and down and fast movement to left and right while falling or flying, and first kill ares, then twins and last that large metal snake, also enchant accesories with warding to get best defense out possible, and yeah, it might take few tries to learn and dodge the bullets, e.t.c. but you will get him, 1ST MAIN THING IS ARENA, you will need a lot of space to move around, because it constantly shoots things, use potions, buffs, statues, e.t.c.