Terraria – Boss Guide Eater Of Worlds and Items Required for Boss Fight

This works on every game mode, but each have different methods:

Arena – Build a few wooden platforms, about 35 wide each and a 5 block gap up between them, like this:
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Then build with solid blocks on the side (optional) to keep out other enimies, like so:
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Normal – Destroy the 3rd shadow orb (using bombs) and run to the arena, start spamming sticky grenades (purchased at demolitionist)
and massive chunks of his body come off at a time, make sure to dodge and never stop moving between platforms.

Expert – Destroy the 3rd shadow orb and run to the arena, grenades / bombs have 70% reduced damage in expert / master mode,
so instead use the Ball O’ Hurt (found when breaking shadow orbs), it’ll take longer but the loot is worth it

Master – Destroy the 3rd shadow orb, run to the arena and use the Ball O’ Hurt or Minishark to damage it, remember to dodge.