Cryogen

CryogenThe Unstable Prison

Statistics

Type	Boss
Environment	Snow biome
Life	57,600 (total)
KB resist	100%

Drops

Coins	25

Map icon

Cryogen is a Hardmode boss which possesses several phases. Defeating Cryogen provides the player with an array of useful items, including those sold by the Archmage and crafted from Cryonic Bars.

Spawn

Cryogen does not spawn on its own, and requires the player to summon it by using a Cryo Key in the Snow biome or Ice biome.

Behavior

CryogenPhase One

Statistics

Life	57,600 / 57,600 (total)
KB resist	100%

Map icon

Cryogen spawns in above the player, creating an aurora in the sky. It performs attacks from the following pool:

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and spawns a ring of rotating icicles around itself.
• After a moment, the icicles are fired radially outwards.
• This attack is repeated 3 times before the boss moves on to the next one.

Tracking Icicles

• Cryogen summons a group of icicles in the air which track the player's movement.
• After a moment, the icicles go still and are fired at the player.
• This attack is repeated 6 times before the boss moves on to the next one.
  • If the player manages to bring Cryogen to its next phase before all 6 groups of icicles are summoned, Cryogen will stop the current attack and transition to the first attack in its successive phase.

Ice Bombs

• Cryogen releases a series of Ice Bombs one after the other.
• It then teleports to a nearby space and releases a hexagon-shaped spread of Ice Bombs from itself.
• Each individual Ice Bomb explodes into a rain of 5 gravity-affected Ice Spikes after 3 seconds.

The first phase cycles through the following attack pattern:

• Radial Icicle Burst
• Tracking Icicles
• Radial Icicle Burst
• Ice Bombs

CryogenPhase Two

Statistics

Life	51,840 / 57,600 (total)
KB resist	100%

Map icon

Cryogen transitions into its second phase at 90% (51,840) health. It loses the lock on its central crystal and gains a new ability. It also gains minor buffs to its current array of attacks.

It performs attacks from the following pool:

Ice Pillars

• Cryogen hovers above the player and summons a ring of 14 rotating icicles around itself.
  • The ring of icicles is fired radially outward intermittently.
• Simultaneously, Cryogen also summons two ice pillars on either side of the player which shoot up from the ground.
  • These pillars explode into homing icicles which fire at the player after a brief delay.
• The ice pillars are summoned up in succession from the ground.
• This attack is repeated 3 times before moving on to the next one.

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and spawns a ring of rotating icicles around itself.
• After a moment, the icicles are fired radially outwards.
• This attack is repeated 3 times before the boss moves on to the next one.

Tracking Icicles

• Cryogen summons a group of icicles in the air which track the player's movement.
• After a moment, the icicles go still and are fired at the player.
• This attack is repeated 6 times before the boss moves on to the next one.
  • If the player manages to bring Cryogen to its next phase before all 6 groups of icicles are summoned, Cryogen will stop the current attack and transition to the first attack in its successive phase.

Ice Bombs

• Cryogen releases a series of Ice Bombs one after the other.
• It then teleports to a nearby space and releases a hexagon-shaped spread of Ice Bombs from itself.
• Each individual Ice Bomb explodes into a rain of 5 gravity-affected Ice Spikes after 3 seconds.

The second phase cycles through the following attack pattern:

• Radial Icicle Burst
• Ice Pillars
• Ice Bombs
• Tracking Icicles
• Radial Icicle Burst
• Ice Bombs
• Radial Icicle Burst
• Tracking Icicles
• Ice Pillars

CryogenPhase Three

Statistics

Life	40,320 / 57,600 (total)
KB resist	100%

Map icon

Cryogen transitions into its third phase at 70% (40,320) health. It is now scratched and sparks emanate from it. Cryogen now gains the ability to teleport as well as well as slight buffs to its current set of attacks. It can also summon a second ring of icicles during its Ice Pillars attack.

It performs attacks from the following pool:

Teleport Dash

• Cryogen teleports along a straight path near the player, releasing homing icicles in its wake.
• Each of these icicles aims at the player before firing after a short delay.
• Cryogen will alternate from its current path to a parallel path in the opposite direction and orientation to the player every 1 second.
• This attack is repeated 4 times (making a total of 8 teleports) before moving on to the next one.

Ice Pillars

• Cryogen hovers above the player and summons a ring of 14 rotating icicles around itself as well as a smaller inner ring of 5 icicles.
  • The ring of icicles is fired radially outward intermittently.
• Simultaneously, Cryogen also summons two ice pillars on either side of the player which shoot up from the ground.
  • These pillars explode into homing icicles which fire at the player after a brief delay.
• The ice pillars are summoned up in succession from the ground.
• This attack is repeated 3 times before moving on to the next one.

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and spawns a ring of rotating icicles around itself.
• After a moment, the icicles are fired radially outwards.
• This attack is repeated 3 times before the boss moves on to the next one.

Tracking Icicles

• Cryogen summons a group of icicles in the air which track the player's movement.
• After a moment, the icicles go still and are fired at the player.
• This attack is repeated 6 times before the boss moves on to the next one.
  • If the player manages to bring Cryogen to its next phase before all 6 groups of icicles are summoned, Cryogen will stop the current attack and transition to the first attack in its successive phase.

Ice Bombs

• Cryogen releases a series of Ice Bombs one after the other.
• It then teleports to a nearby space and releases a hexagon-shaped spread of Ice Bombs from itself.
• Each individual Ice Bomb explodes into a rain of 5 gravity-affected Ice Spikes after 3 seconds.

The third phase cycles through the following attack pattern:

• Ice Pillars
• Radial Icicle Burst
• Ice Pillars
• Teleport Dash
• Tracking Icicles
• Ice Bombs
• Radial Icicle Burst
• Tracking Icicles
• Ice Bombs
• Teleport Dash

CryogenPhase Four

Statistics

Life	31,680 / 57,600
KB resist	100%

Map icon

Cryogen transitions into its fourth phase at 55% (31,680) health as cracks appear on it. It now can directly charge at the player and gains noticeable buffs to its attacks, including a second ring of icicles to its Radial Icicle Burst.

Cryogen performs attacks from the following pool:

Charge

• Cryogen lines up near the player and charges, spinning wildly at them.
• It releases rows of double icicles along its path which aim at the player and fire after a brief pause.
• This attack is repeated 3 times before moving on to the next one.

Teleport Dash

• Cryogen teleports along a straight path near the player, releasing homing icicles in its wake.
• Each of these icicles aims at the player before firing after a short delay.
• Cryogen will alternate from its current path to a parallel path in the opposite direction and orientation to the player every 1 second.
• This attack is repeated 4 times (making a total of 8 teleports) before moving on to the next one.

Ice Pillars

• Cryogen hovers above the player and summons a ring of 14 rotating icicles around itself as well as a smaller inner ring of 5 icicles.
  • The ring of icicles is fired radially outward intermittently.
• Simultaneously, Cryogen also summons two ice pillars on either side of the player which shoot up from the ground.
  • These pillars explode into homing icicles which fire at the player after a brief delay.
• The ice pillars are summoned up in succession from the ground.
• This attack is repeated 3 times before moving on to the next one.

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and spawns 2 rings of rotating icicles around itself.
• After a moment, the icicles are fired radially outwards.
• This attack is repeated 3 times before the boss moves on to the next one.

Ice Bombs

• Cryogen releases a series of Ice Bombs one after the other.
• It then teleports to a nearby space and releases a hexagon-shaped spread of Ice Bombs from itself.
• Each individual Ice Bomb explodes into a rain of 5 gravity-affected Ice Spikes after 3 seconds.

The fourth phase cycles through the following attack pattern:

• Charge
• Ice Pillars
• Ice Bombs
• Radial Icicle Burst
• Ice Pillars
• Teleport Dash
• Ice Bombs
• Charge
• Radial Icicle Burst
• Teleport Dash

CryogenPhase Five

Statistics

Life	23,040 / 57,600 (total)
KB resist	100%

Map icon

Cryogen transitions into its fifth phase at 40% (23,040) health. Its core is now partially exposed and the boss can now summon horizontal aurora shards from the side of the player.

Cryogen performs attacks from the following pool:

Aurora Shards

• Cryogen hovers above the player and summons horizontal Aurora Shards on either side of the player.
• Each Aurora Shard aligns itself to the player before accelerating at them.
• The attack ends after approximately 11.5 seconds.

Charge

• Cryogen lines up near the player and charges, spinning wildly at them.
• It releases rows of double icicles along its path which aim at the player and fire after a brief pause.
• This attack is repeated 3 times before moving on to the next one.

Teleport Dash

• Cryogen teleports along a straight path near the player, releasing homing icicles in its wake.
• Each of these icicles aims at the player before firing after a short delay.
• Cryogen will alternate from its current path to a parallel path in the opposite direction and orientation to the player every 1 second.
• This attack is repeated 4 times (making a total of 8 teleports) before moving on to the next one.

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and quickly spawns 2 rings of rotating icicles around itself in succession.
• After a moment, the icicles are fired radially outwards.
• This attack is repeated 3 times before the boss moves on to the next one.

The fifth phase cycles through the following attack pattern:

• Charge
• Teleport Dash
• Charge
• Aurora Shards
• Radial Icicle Burst
• Teleport Dash
• Aurora Shards

CryogenPhase Six

Statistics

Life	14,400 / 57,600 (total)
KB resist	100%

Map icon

Cryogen transitions into its final phase at 25% (14,400) health. Its core is now completely exposed and Cryogen can now violently ricochet around the player, releasing homing aurora shards. All of its attacks are performed noticeably faster compared to their original state.

Cryogen performs attacks from the following pool:

Winter Barrage

• Cryogen violently ricochets around the player, charging in their direction.
• Every time Cryogen changes its direction, it will randomly release either 3 tracking icicles or 2 homing Aurora Shards.
• It ricochets around the player 8 times before moving on to the next attack.

Aurora Shards

• Cryogen hovers above the player and summons horizontal Aurora Shards on either side of the player.
• Each Aurora Shard aligns itself to the player before accelerating at them.
• The attack ends after approximately 13 seconds.

Charge

• Cryogen lines up near the player and charges, spinning wildly at them.
• It releases rows of double icicles along its path which aim at the player and fire after a brief pause.
• This attack is repeated 3 times before moving on to the next one.

Teleport Dash

• Cryogen teleports along a straight path near the player, releasing homing icicles in its wake.
• Each of these icicles aims at the player before firing after a short delay.
• Cryogen will alternate from its current path to a parallel path in the opposite direction and orientation to the player every 1 second.
• This attack is repeated 4 times (making a total of 8 teleports) before moving on to the next one.

Radial Icicle Burst

• Cryogen hovers above the player, idling from left to right, and spawns 2 rings of rotating icicles around itself.
• After a moment, the icicles are fired radially outwards and the rings are regenerated.
• This attack is repeated 3 times before the boss moves on to the next one.

Tracking Icicles

• Cryogen summons a group of icicles in the air which track the player's movement.
• After a moment, the icicles go still and are fired at the player.
• This attack is repeated 6 times before the boss moves on to the next one.

The sixth phase cycles through the following attack pattern:

• Teleport Dash
• Aurora Shards
• Winter Barrage
• Radial Icicle Burst
• Teleport Dash
• Aurora Shards
• Radial Icicle Burst
• Winter Barrage

Aftermath

• A status message appears which reads "The ice caves are crackling with frigid energy.", indicating that Cryonic Ore has generated in the Ice biome.
• If at least two mechanical bosses have been defeated, Cryo Slimes will begin to spawn in the Ice biome.
• The Archmage will begin to arrive if provided suitable housing.
  • If the Archmage isn't in the player's current world, he will drop alongside Cryogen's loot.
• The Rimehound enemy's stats are increased and will start dropping Essence of Eleum.

Tips

Trivia