Skeletron Prime

"You feel the air getting colder around you..."

Skeletron Prime is a Hardmode Mechanical Boss which is a much harder version of Skeletron. He is summoned with the Mechanical Skull at night. Players have until dawn to kill him. He can also randomly spawn at dusk in Hardmode if he has not yet been defeated, in this case signaling his approach via the chat message, "You feel the air getting colder around you" or "The air is getting colder around you".

Attacks
Skeletron Prime has four limbs which are all immune to the Poisoned and On Fire! debuffs:


 * Prime Cannon fires flashing bombs that do not destroy blocks, usually up into the air rather than directly at the player.
 * Prime Laser shoots Death Lasers similar to those of Retinazer and The Destroyer, and is always pointed at a player.
 * Prime Saw and the Prime Vice swipe around dealing hefty amounts of damage on contact.

Skeletron Prime will occasionally enter into a "Rage Mode," in which his attacks become more aggressive:


 * Skeletron's Head will grow spikes and start spinning towards the player slowly. Damage and defense is doubled.
 * Prime Cannon will aim at the player directly and fire rapidly.
 * Prime Laser will fire more frequently.
 * Prime Saw will begin homing directly towards the player's location.
 * Prime Vice becomes more aggressive and frequently lunges towards the player.

Prime himself is much more mobile than his predecessor, and will regularly move off-screen, which can make him difficult to hit reliably with ranged weapons.

Like Skeletron, if he is not dead by dawn he will begin to dish out instant kills and will take only 1 damage from attacks (2 for critical hits).

Tips

 * Standing on platforms far from blocks can mostly nullify the effects of the Prime Cannon, as its projectiles only detonate on blocks, while passing through platforms harmlessly.
 * Skeletron Prime can be the most profitable boss in the game, as the Souls of Fright can be crafted into Naughty Present to summon the Frost Moon, netting large amounts of money per 5 souls.