Necromancer

s are high level Mages found only in the Dungeon in Hardmode. They are similar in appearence to Dark Casters, being essentially Skeletons wearing blue robes (with several key differences in appearence). Although they appear with these robes, they are not dropped by the enemy. They have the ability to teleport, and attack the player with a blue magic beam, which can bounce off walls many times.

They are similar in nature to Fire Imps and Goblin Sorcerers, They can be very annoying if you are attempting to loot items from chests. However, if you have enabled the Auto-pause feature (available as of Update 1.0.4) you can take items from chests without much trouble. Having a Cobalt Shield will also make the process easier. The Vilethorn is useful against them because the constant damage them and they will be unable to teleport or cast the magic beam.

The Necromancer also occasionally drops Golden Keys, which are able to unlock locked Golden Chests in Dungeons or on Floating Islands.