Wraith

Wraith is a black ghost-like enemy with glowing, red eyes which only spawns in Hardmode. They have 200 health each and can travel through walls. Note: Wraiths cant pass through regular stone blocks. Wraiths commonly spawn at the bottom of Corruption Chasms. Wraiths will also spawn during Blood Moons, and are a severe hazard to the liveliness of your NPCs due to their ability to pass through walls.