
It usually remains diagonal to the player. Prime Vice will swipe around wildly, making occasional lunges at the player.Prime Saw usually remains under the player, moving up and down.Prime Cannon fires Bombs every 2.33 seconds that do not destroy tiles, usually up into the air rather than directly at the player.Skeletron Prime's four limbs all have unique attacks: The head does not actively attempt to make contact with the player.

It can accelerate infinitely in order to move back into this area.

Skeletron Prime's head constantly endeavors to remain between 31.5 and 12.5 tiles above the player and within 6.25 tiles of either side of the player. When Otherworldly music is enabled, the track Boss 2 (Otherworldly) (Otherworldly).mp3 will play instead. While Skeletron Prime is alive, the music Boss 1 will play. If Skeletron Prime is not defeated by dawn, it will behave much like a Dungeon Guardian: It will cease using its limbs and instead charge at the player at extremely high speeds, dealing usually lethal damage upon contact. If spawning this way, its arrival is announced by the status message " The air is getting colder around you.". It also has a 10*1/10 (10%) chance to spawn naturally at dusk once a Demon or Crimson Altar has been destroyed, as long as it has not yet been defeated at least once in the current world. Skeletron Prime can be summoned manually using a Mechanical Skull at night (7:30 PM to 4:30 AM).

It consists of a head and four limbs, but, similarly to Skeletron, only the head needs to be defeated to defeat the boss. Skeletron Prime is a Hardmode mechanical boss which is essentially a more difficult version of Skeletron. Not to be confused with Skeletron, the pre-Hardmode boss.
