Blazing Wheel

The Blazing Wheel is an indestructible Enemy found in the Dungeon. It appears to be a ring of fire, traveling along the walls and floors of the Dungeon. Blazing Wheels move quicker than most Dungeon enemies and produce light. They appear in areas that have a Dungeon Brick Wall background.

"Not quite a great ball of fire, this hot rod sets the dungeon pathways ablaze, making traversal more than trivial. Oh yeah, you also can't hurt it. Go figure" -u/Mimikyu-Overlord

Movement

 * They spawn and despawn off-screen, like any other enemy.
 * They will go through open doors, but not through closed ones.
 * They travel through Platforms, not along them.
 * If you remove all of the blocks the Blazing Wheel is spinning on, it will fly towards a random wall.
 * If you surround a Blazing Wheel with blocks until there are only 2-3 tiles of space for it to maneuver, it will despawn.
 * Blazing Wheels will go outside of the Dungeon, however it is very rare, and you must follow it until it does.
 * They move at a surprisingly fast speed, making it harder to dodge them.

Tips

 * A useful way to avoid being hit by the Blazing Wheel is to use a Multi Hook to suspend yourself in midair, rather than standing still on a Dungeon surface.
 * To avoid the Blazing Wheel's attack, look for its light in dark areas, move as far away as possible, then jump or avoid it if you don't want to lose health.

Trivia

 * The Blazing Wheel, along with the Spike Ball, the True Eye of Cthulhu, and Golem Head in his second stage are the only four invincible enemies in Terraria.
 * Although the Blazing Wheel cannot be damaged, it has most of the statistics of a normal enemy, including a death sound, a hit sound, defense, and immunities to a few debuffs.
 * The Blazing Wheel is likely based off the Hothead from the Mario franchise. It moves in similar motions when climbing on walls and ceilings and is also based around a fire theme.
 * Though, they more closely resemble Rinkas from Metroid.