The Necro

The Necro is a War Mode biome that replaces all of the Corruption if you use a Deadly Emblem inside of it.

The creation of the Necro is permanent, and stops all collection of all corruption items.

Every item that could be used in the Corruption, like worm bait, can be used here.

Appearance
The Necro is covered in black grass, and has many groups of Skelestone. The background's trees are now covered in black slime, and the destroyable trees are called Skelewood. Much of the Necro's enemies are skeletons and grand amounts of bones litter the area.

The music played is a remix of the Corruption and the Dungeon themes

The underground Necro has much in common with the underground Corruption, with the exception of colour, music, and shadow orbs. You'll find floating skulls randomly in this area, they act just like a shadow orb, but they are replaced every 50 Terraria days.

The music played is a remix of the Necro and the Underground themes

Monsters
(The following monsters only spawn after the defeat of Skullet)
 * Destroyer of Souls
 * Swallower
 * Skeleton
 * Angry Bones
 * Dark Caster
 * Light Caster
 * Servant of Skeletron
 * Bone Crawler
 * Eater of Suns (boss)
 * Skullet (boss)
 * Ancient Skull
 * Necro Serpent
 * Giant Bone Crawler
 * Bone Jockey