Spike Ball

The Spike Ball is an indestructible enemy found in the Dungeon which resembles a mace that swings around in a circle from a central pivot point (which cannot be destroyed either), and deals damage to the player on contact. Separate Spike Balls can have differing chain lengths. They spawn and despawn off-screen like any other enemy – if the player leaves a room and returns later, it will have a different configuration of Spike Balls. They appear in Dungeon areas with a Brick Wall.

Tips

 * Placing a Torch at the place where a Spike Ball swings through the floor or walls will allow players to keep track of its path.

Trivia

 * Since Spike Balls are considered enemies, many effects that usually apply to enemies apply to them as well. Note that none of these deals damage to Spike Balls.
 * The Leaf Crystal that hovers above the player when wearing Chlorophyte armor fires at Spike Balls.
 * The piranha fired from the Piranha Gun can attach to the Spike Balls.
 * Pumpkins from The Horseman's Blade will follow Spike Balls.
 * NPCs will attack Spike Balls.
 * The Spike Ball, along with the Blazing Wheel, True Eye of Cthulhu, and the flying Golem Head are the only four invincible enemies in Terraria.
 * The chain that swings the Spike Ball bounces up and down as it swings.
 * Spikes in the Dungeon inflict the Bleeding debuff, while the Spike Ball does not.