Blade Demon

Blade demon is a pre-hardmode enemy summoned by using the Strange Sword in the underworld during the night.

Behavior
It goes at different speeds, depending on how far away the player is (farther away makes it go faster). It can phase through blocks and target the player. About once every second, it spawns a Spirit Sword.

Known Bugs
- If summoned during day, it will appear to spawn for one tick but then disappear.