The Destroyer

The Destroyer is a harder version of the Eater Of Worlds that was added in the 1.1 update. It has a total of 80,000 health altogether and is made of metal, just like Skeletron Prime's head and hands. The Destroyer sends out small flying enemies called Probes that shoot lasers.

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The Destroyer does not break when being fought but instead dies as one whole entity, the red orbs (seen on the picture on the right) pop out from The Destroyer during the fight as it loses HP.

Tips
The destroyer is the easiest of the 3 bosses for a melee character, going down easily with the dao of pow shot across his body with potions such as ironskin, regeneration and thorns. An easy way to beat him is by using dart traps and an adamatite glaive.
 * It's advised to use weapons that can pierce through multiple targets, such as unholy arrows, jester arrows, flamethrower, or just a broadsword; Holy arrows are also effective, as the stars summoned can pass through targets as well, and joined with the Star Cloak, spamming probes down should be easy. Flamethrower is effective because it does damage really fast and it passes through at least 3 segments per shot. The Magical Harp is extremely efficient against this boss.
 * If the player doesn't have access to end-game weapons yet, the best choice would be the Cursed Flames, as they can easily fill up the screen and damage the boss repeatedly while also making short work of the Probes.
 * The boss is immune to debuffs, but the probes aren't, so cursed attacks or the Dao of Pow will be very effective on them..
 * Much like its lesser form, it's not very effective when faced with players on platforms. Making platforms with 15 spaces in between each will ensure the boss itself doesn't reach the player, however its lasers can still shoot you, and be sure to give yourself plenty of running space, about 80 blocks wide.
 * For single player: Adamantite or hallowed armor, at least 2 potions per each kind that increase your stats or help you fight (Ironskin potion, thorn potion, gravitation potion, hunters potion, swiftness potion, shinepotion, night owl potion), a flamethrower with 475 gel loaded, philosophers stone and 10 greater healing potions. For really advanced players no arena required.
 * Destroyers probes are useful for healing so watch out for hearts they drop. (100% chance of dropping a heart)
 * An arena that has several small rooms can prevent The Destroyer from firing hitting lasers at you, effectively reducing taken damage, however you must still avoid the rest of The Destroyer's body as well.
 * Another method is to build a room/arena out of dungeon bricks.Then buy as many explosives as possible and throw grenades, dynamite or bombs.
 * You could also create a room up in the sky, containing your nurse as the destroyer tends to kill all your npc's if your battle is close to your house(also it cant reach very high up), it will be very effective to fly to the nurse with a gravity potion to fully heal. Note that a Wyvern could spawn and kill the nurse but with a bit of luck you could keep her alive. just bring some cash (at least 1-2 Gold), gravity potions (2-3), your best ranged weapon with cursed bullets/arrows (fill up your whole ammo slots plus a bit more) for the probes and also the Destroyer as it needs to die before sunrise. some emergency healing pots and other defense/attack pots might also be useful.
 * Another method would be make a good tall sky bridge away from your house where he stays on the ground then you make a hole and shoot through it.
 * It seems that, if you are standing INSIDE of the Destroyer and firing the Crystal Storm, it does mass amounts of damage depending on how many sections of it are overlapping you.
 * Another option is to reforge your accesories for more defense (at least Armored is recommended). Coupled with an ironskin potion, you can easily reach 70-75+ defense (with Adamantite set). With that kind of gear, you can simply battle him on the ground, melee him and retreat when your health falls to dangerous levels (it'll take a good while though). It is even possible to outheal him with a philosopher's stone and enough defense, since you'll mostly be receiving damage from the body.
 * Another method of killing him with the dao of pow is that after summoning you use the dao of pow and let it stay right next to you, then you stand next to it (prefferably with cobalt shield or hooked to the ground that you dont move) and just wait INSIDE the destroyer,this is a fast way to accumulate damage to the destroyer and keep huge damage from accumulating on you since the destroyer ITSELF is weaker than the lasers it shoots or the probes, if there are alot of probes you can just kill them with the dao of pow and continue like before though i wouldn't suggest this method as it is really boring.I suggest you have adamantite set with warding accessories. This is soloable with adamantite set and this way you may kill two destroyers in one night but again i do not suggest this method as this is takes all the fun out of the fight. This way you can fight without buffs (well except for the ale that can speed the fight up a little).