Wall of Flesh

The Wall of Flesh (WOF) is a new boss located in The Underworld that has been introduced in the 1.1 patch.

To summon it you have to throw a guide voodoo doll in the lava.

After defeating this boss, your world will enter hardmode and you'll be facing tougher enemies.

The Wall of Flesh has several attacks. First of all, it always has little things sticking out of branchy tentacles that move towards and damage you. These are called The Hungry. He also has an attack where his eyes shoot lasers, and he's always chasing you towards the left side of hell. Obsidian skin and gravitation potions are suggested to help you get by. It possibly licks you with The Tongue as a form of attack, or may drop the The Tongue as an item upon death. It summons worms out of its mouth and shoots lasers out of its eyes. It spawns in The Underworld. It looks like it is made out of left over body parts including 3 fleshy Eye of Cthulhu, which is where many of its attacks appear to be based.