Wall of Shadows

The Wall of Shadows is a Hardmode boss. Before the 1.3.1.7 update, it served as a Wall of Flesh counterpart for worlds with Corruption.

Spawn
It does not spawn on its own, the only way to summon it is to throw a Shadow Relic into lava in the underworld (Much like in the Wall of Flesh). The boss can be only summoned if Plantera is defeated and there is a Dryad in the world. After throwing Shadow Relic the Dryad will die.

Behavior
The Wall of Shadows behaves almost exactly as the Wall of Flesh does but has a different physical appearance. Unlike the Wall of Flesh, which has two eyes and one mouth, the Wall of Shadows only has one eye on the first phase which turns into a mouth on the second phase.

First stage

 * Spawns with Shadow Hands hanging on chains which move toward the player and damage them. When a Shadow Hand is killed, the chain is broken and the Shadow Hand chases the player.
 * Rapidly shoots purple lasers.
 * Shoots a round of purple lasers.

Second stage

 * Has attacks from first stage.
 * Summons Shadow Steeds that chase the player.
 * Shoots a large shadowbeam that can bounce off walls.

Expert Mode

 * Shadow Hands can't despawn while the Wall of Shadows is still alive.
 * The Wall of Shadows moves faster as it's health depletes.
 * It can reach up to 50 mph when below 500 HP (As compared to the Hermes Boots at only 30 mph, Lightning Boots at 34, and the bunny mount at 38).
 * Shoots lasers more rapidly.
 * Can inflict Shadowflame debuff on player for 4 seconds.

Trivia

 * The Wall of Shadows Boss and its attacks came from a suggestion made by Zoomo
 * The Wall of Shadows bears a resemblance to Wall of Flesh, but it possesses different attacks and stats.
 * Unlike the Wall of Flesh, which spawns on the side of the Underworld you're closest to, the Wall of Shadows will spawn on a random side of the Underworld, so it is recommended to start the fight in the middle of the Underworld.