Wraith

Wraiths are dark ghost-like enemies with glowing red eyes which only spawn in Hardmode. They have 200 health and can travel through blocks and walls. Wraiths are a severe hazard to the liveliness of your NPCs due to their ability to pass through blocks and walls.

When a Wraith attacks, it occasionally gives the Slow debuff.

One or two Wraiths will appear after destroying a Demon Altar.

When not inside any blocks, Wraiths appear to be unable to gain any height.