Permafrost

Permafrost is a Hardmode boss that is intended to be fought after Golem has been defeated. Permafrost is one of the six elemental bosses, and defeating him will remove the Hypothermia effect.

Spawn
Permafrost can be summoned with an Enchanted Ice Crystal in the Snow biome at anytime.

Behaviour
Permafrost teleports frequently, usually to a certain position before initiating a specific attack. He has a set attack pattern; once he finishes his attack pattern, he restarts it.

Attacks
Below 50% health:
 * Shoots sets of four icicles at the player.
 * Releases a ring of 5 / /  ice magic balls, which spiral out clockwise for 4 seconds before staying in position for 6 seconds. Then, rapidly teleports above the player before quickly dashing downwards. Each dash ends after 1 second or when he comes into contact with tiles after passing the player.
 * Stops in place and roars, shortly raining down ice in an area around him.
 * Despawns all existing Perma Orbitals, then spawns a ring of 5 / /  Perma Orbitals around himself. The Orbitals rotate around Permafrost while also periodically converging into or away from him.
 * Teleports to the right of the player then dashes at them, repeating on the left.
 * Releases a ring of 5 /  /  ice magic balls, then summons homing ice shards randomly around the player. Homing ice shards rapidly accelerate when not turning and explode into a star on contact with tiles.
 * Shoots a short-ranged stream of frigid breath.
 * Teleports around the player before quickly dashing at them.
 * Gains a new attack where he rapidly summons sets of three homing ice shards.

Aftermath

 * Hypothermia is removed from the player.
 * The player runs into their second Encounter. Icy fog covers the screen, the player is inflicted with Darkness, rain starts to fall, and the following messages appear above them:
 * "Who are you really?"
 * "A simple lost soul?"
 * "The path ahead is long."
 * "You are getting closer."
 * The encounter ends a few seconds after the final message and the screen returns to normal.

Trivia

 * His theme is called "Coldblooded Cry [The Awakening Mix]" and is composed by Ranipla and GENIH WAT.
 * This theme had earlier versions.
 * Permafrost is one of the six elemental bosses: the others being Wasteland, Infernace, Regaroth, Aqueous, and Void Leviathan.

Lore
The frozen depths weren't always as cruel as the human eyes were able to see. Some creatures from the past had considered it their very own utopia, a place to retreat to when the times would get rough. The beings of such place were living in great peace, along with their very own king, Permafrost, a simply unrivaled spirit of the cold. For him, these creatures were his children, his own to raise up, seeing as he was akin to them in his own past. Born from the essence of a thousand ice elementals, he had risen to greater power and ruled over his land kindhearted. Though, within the kindred spirit, there was his own despair residing, the worry of losing everything he worked towards to.

It is only the matter of unfortune, that such worry happens to come true, for a race from the depths of the void had fallen over the tundra, annihilating anything in sight. Permafrost's children were no exception, for they were destroyed within seconds. With all of his might, he tried to repell their attack, insisting to protect what's left, yet it was all for nothing. The damage was done and the spirit's pride has been broken. An internal unholy rage stirred within Permafrost. In his blindness, he absorbed the remaining souls of the void and became corrupt. An arctic wave has fallen upon the world, a call of despair - as a fallen spirit vowed to promise any creature of this world a cold and ruthless death, for his vengeance could never be satisfied.