WoF is pretty tough to beat last I remember so you best do some prep before you get started.
I highly suggest crafting wings and getting a Minishark or something else that can fire really fast.
Level out the area in the Underworld and cover any lava pits.
The idea is to shoot WoF as you run backwards and eventually it'll die.
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Things you need
Demonite amour
Minishark with 700 meteorite ammo
Last and hardest a bridge across the underworld made of platforms