Cryogen will not fire projectiles if it does not have a direct line of sight to the player, with the exception of Ice Bombs.In the case of Ice Bombs, two spreads of three Ice Shards are fired when they explode, one in each direction parallel to the direction the Ice Bomb was moving.All Ice Shards/Blasts are fired in fixed patterns throughout the fight.Cryogen's projectiles are colored deep blue during the day and white at night.Unlike most screen effects from other bosses, it cannot be toggled off by lighting options in the Settings Menu. While Cryogen is alive, the sky above the player is filled with a waving rainbow aurora effect.The Angry Dog enemy's stats are increased and will start dropping Essence of Eleum.If the Archmage isn't in the player's current world, he will drop alongside Cryogen's loot.The Archmage will begin to arrive if provided suitable housing.Cryo Slimes will begin to spawn in the Cavern layer.Once Cryogen is defeated for the first time, Cryonic Ore spawns in the Ice biome.Cryogen and its projectiles are even more aggressive and faster.The outer and center rings have four Ice Blasts, while the center ring has eight.Below 15% health, its appearance will change one last time and its charges will each each fire three concentric rings of Ice Blasts.After spawning 2 sets of ice bombs, it rapidly charges the player 3 times before repeating this pattern.

Instead, a set of Ice Bombs is spawned every 1.25 seconds while hovering. The Ice Bomb attack no longer occurs every 10 seconds.Cryogen loses the ability to summon servants.Gains a new phase when below 25% health:.Cryogen and its projectiles are slightly faster.Transitions into Phase 2 at 85% health, Phase 3 at 70%, Phase 4 at 55%, and Phase 5 at 40%.They also inflict Glacial State for 1 second, Chilled for 1.5 seconds, and Frostburn for 2 seconds on contact.Ice Bombs are smaller and cannot hurt the player or inflict status effects for the first 2 seconds after they're spawned.This occurs in all of the above phases alongside other attacks.After these bombs hit tiles or 5 seconds pass, they explode into a hexagonal burst of 6 gravity-affected Ice Shards. Every 10 seconds, Cryogen releases a cross-shaped burst of 4 Ice Bombs, with a 50% chance for it to be rotated 45 degrees.Regenerates its shield every 12 seconds instead of 18.Its rotation speed will increase when below 5% / 7.5% and even further when below 2.5% / 5% / 30% health.Rapidly and loosely accelerates towards the player, charging at them when it gets close.Stops firing either projectiles for the remainder of the fight.The location it teleports to is surrounded by a cloud of blue dust two seconds prior to telegraph its location.

Every 5 seconds, Cryogen will teleport somewhere near the player and start attacking again.

Fires Ice Blasts at double the frequency.

Loses the ability to regenerate its shield.

Cryogen performs this charge twice before resuming its pattern.

After firing 3 bursts of Ice Blasts, briefly spins in place before charging at the player and fires three concentric rings of eight Ice Blasts.

Slowly chases the player but stays slightly below the player.

After firing 3 bursts of Ice Blasts, briefly spins in place before charging at the player and firing two concentric rings of ten Ice Blasts before flying up and resuming its pattern.

The amount of Ice Blasts are reduced from 16 to 12 from this phase onwards.

Attempts to fly above the player while continuing to fire bursts of Ice Blasts.

Fires an evenly-spaced ring of 16 Ice Blasts every 2 seconds.

Slowly chases and levels with the player.

Leaving the Snow biome will cause Cryogen to enrage, almost doubling its speed and acceleration.

Aurora Spirits fly towards the player similarly to Ancient Vision, while both Cryocores accelerate towards the player.

Aurora Spirits may have a chance to replace small Cryocores from its third phase onwards, and Large Cryocores are able to replace either servants on its fifth phase onwards. Throughout the fight, it will also summon 2 Small Cryocores every 7.5% of its health taken. When destroyed, the shield will explode into a cross-shaped burst of 4 Ice Blasts. It will progress through these phases as it loses health.Д¬ryogen also spawns with an ice shield which protects it and inflicts contact damage this shield must be destroyed to directly attack Cryogen and will regenerate 18 / 12 seconds after being destroyed. Cryogen does not spawn on its own and requires the player to summon it with a Cryo Key while in the Snow biome at any time.Д¬ryogen has six phases, each of which has its own attack pattern and AI.

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