Wall of Steel

The Wall of Steel is the hardmode version of the Wall Of Flesh, and a boss that can be spawned in the Underworld by letting a Mechanic Voodoo Doll fall into lava after Hardmode has been unlocked. It is a stronger, mechanical version of the Wall of Flesh. Once the doll has fallen into lava, the mechanic will die, and the Wall of Steel will awaken.

Stats
40,000/85,000 Heart (each eye)

60,000/145,000 Heart (mouth)

100,000/225,000 Heart (Body)

104/215 Damage

94/124 Damage (laser)

600 Damage (when try exit in underworld)

100% KB resistance

Battle
Like the Wall of Flesh, the Wall of Steel has a mouth and two eyes, the eyes representing the Twins and the mouth representing the Destroyer. The mouth spawns out Elite Probes every 4 seconds as a replacement to The Hungry II. The eyes must be shot at first. Once they die, Probes will stop spawning out of the mouth. Before the eyes' death, the rest of the body is indestructible. When the eyes die, the mouth will start breathing fire at the player. The rest of the body will be covered with spines that inflict damage to any player that attacks it with a melee attack. Once the mouth dies, the entire body will begin moving faster and also be open to attack. Once the body is destroyed, the drops from the Wall of Steel will spawn inside a square of Demonite/Crimtane Bricks.

The defeat of the Wall of Steel marks the beginning of War Mode. Three types of ore will also spawn: Cryocite Ore in the Snow biome, Verdantite Ore in the Jungle and Aridite Ore in the Desert.

Drops
100 gold coins

10 - 20 Greater Healing Potions

Crimson Emblem (Only if the world has Crimson)

Corruption Emblem (Only if the world has Corruption)

Only one of the following will drop:

War Pickaxe (25%)

Sun Waraxe (25%)

Shadow Blade (25%)

Steel Gun (25%)

Only drops in Expert Mode:

Treasure Bag (Wall of Steel)