Wall of Flesh

. The Wall of Flesh (WOF) is a boss located in The Underworld.

To summon it, a Guide Voodoo Doll must be thrown into the lava (though there's a glitch that can prevent it from being re-summoned; see the bugs section for details). The Wall of Flesh will not spawn if the Guide is already dead, it will spawn as long as there is a guide alive on the map.(Even if you have already beat him you can re-summon him.) The Wall of Flesh will spawn from the direction of the nearest world edge. When the battle begins, all players will have the Horrified debuff. This debuff lasts until the Wall of Flesh is killed or despawns, or you die.

The Wall of Flesh has several attacks. First of all, it has tiny mouths resembling Man Eaters that move towards and damage you. These are called The Hungry. He also has an attack where his eyes shoot lasers, with less health it shoots more lasers. Finally, it will summon Leeches out of its mouth, which will burrow after you.

If you become trapped in between the boss and a wall, it will squeeze you through those blocks and send you flying. A type of grapple or the Gravitation buff is recommended for this scenario. Obsidian Skin and Water Walking Potions are also suggested to transverse the Underworld quickly.

The debuff, The Tongue, causes the Wall of Flesh to drag characters that attempt to escape, such as leaving the underworld or running behind it, to in front of its mouth. Using the Magic Mirror causes you to die, with the message " tried to escape."

To destroy the Wall of Flesh you must attack its three eyes (the Mouth of the beast is considered an eye, thus follows the same AI as its eyes) as they share the one life counter, so shooting at any of the three will deplete the Wall of Flesh's health. The wall of flesh (apart from the three eyes) is transparent to weapons, and shooting the Wall of Flesh there will not deplete its health. Unlike other bosses, this boss does not despawn if you die. It will remain alive until it crosses the edge of the map. Trying to summon it again until it despawns will simply destroy the Guide doll.

When the Wall of Flesh is killed, it leaves its drops in an enclosed box of Demonite Bricks. This way, the drops do not fall into lava. Even if they did in some way, being the level of item they are, they wouldn't melt.

After defeating this boss, your world will enter hardmode and you will face tougher enemies. This will also generate two diagonal stripes of The Hallow and The Corruption somewhere, usually near your original spawn point. These lines extending from The Underworld right to the surface, therefore creating Underground Hallow and Underground Corruption. (If you hack Hallowed blocks or Holy Water into your inventory and place/use it to spread the Hallow before the WoF is defeated, the respective Hallow enemies will not spawn until the WoF is defeated.)

Tips
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 * Here's a short video explaining how to kill the Wall:
 * Certain consumables such as water walking potion, gravitation potion and obsidian skin potion can make traversing the underworld much less difficult.
 * Alternatively you can use the bridge strategy:
 * Drain any upper ledges of lava and remove them.
 * Build a bridge over top of the lava and buildings, (remove anything that will get in the way if you're jumping from the bridge.)
 * On a bridge you can get into melee range if desired. The harpoon's ability to rapid fire in extreme close range allows it to excel in these conditions.
 * Killing the additional spawned monsters, (The Hungry, The Hungry II and Leeches,) will drop hearts and stars. Unfortunately they tend to drop close to the WOF and can fall into lava. With a bridge you can capture these and collect them while easily remaining mobile and/or in melee range.
 * The WOF's spawn location is determined by where the Voodoo Doll was thrown in relation to the center of the world. Thus, you can get the maximum space to fight the WOF by reaching the edge and throwing the doll toward that edge. (E.G. Reach the West edge, throw the doll.)

History

 * Early mentions:
 * Tiyuri tweet 24th October 2011
 * Bunny Power 2nd November 2011

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