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Cryogen

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Cryogen
Cryogen.png

Cryogen2.png
Statistics
TypeBoss
EnvironmentSnow Biome
AI TypeCryogen AI
Damage60 / 102 / 120 / 150 (melee)
46 / 80 / 100 (frost blast)
52 / 92 / 115 (ice shard)
44 / 88 / 110 / 137 (ice bomb)
Max Life17,900 / 28,640 / 42,080 / 63,840
Defense (DR)10 (10% DR)
KB Resist100%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration2 seconds (Contact and Ice bomb)
1.5 seconds (Frost bolts)
1 second (Ice shards)
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1.5 seconds (Contact and Ice bomb)
1 seconds (Frost bolts)
0.5 second (Ice shards)
Debuff tooltipYour movement speed has been reduced
Inflicts debuffFrozenFrozen
100% chance
Debuff duration0.5 seconds (Frost bolts)
Debuff tooltipYou can't move!
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesArmor CrunchDemon FlamesPlagueNightwitherShredWhispering DeathSilva StunDaybrokenHoly FlamesGod Slayer InfernoMarkedOn Fire!Brimstone FlamesShellfish ClapsEnraged
Drops
Coins10 Gold Coin
Cryogen map.png
Map Icon

Cryogen Trophy.png "The ancient ice spirits have been unbound!" Cryogen Trophy.png

Cryogen is a Hardmode boss fought in the Snow biome.

Spawn[edit | edit source]

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 of day.

Behavior[edit | edit source]

Cryogen has six phases, each of which has its own attack pattern and AI. It will progress through these phases as it loses health.

Cryogen 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 shortly after being destroyed. When destroyed, the shield will explode into a star-shaped burst of frost bolts.

Throughout the fight, it will also summon Cryocores and Aurora Spirits upon taking damage. In addition it will summon invincible ice bombs which fly away from it and explode into ice shards after some time or upon hitting a surface.

Leaving the Snow biome will cause Cryogen to enrage, increasing its movement speed by roughly two times.

Attacks[edit | edit source]

Phase 1[edit | edit source]

  • It will begin to rain/snow.
  • Chases players and fires star-shaped bursts of frost bolts.
  • Periodically releases ice bombs that explode into ice shards after a few seconds.

Phase 2[edit | edit source]

  • Transitions at 83% health.
  • Cryogen attempts to fly above the player while continuing to fire star-shaped bursts of frost bolts and ice bombs.
  • If Cryogen gets directly above the player, it will rain ice shards down on them.

Phase 3[edit | edit source]

  • Transitions at 66% health.
  • Cryogen attempts to fly level with the player.
  • Continues firing star-shaped bursts of frost bolts and ice bombs.
  • Fires bursts of ice shards which fly some distance in front of it before raining down.

Phase 4[edit | edit source]

  • Transitions at 49% health.
  • Cryogen attempts to fly above the player
  • Continues trying to release ice bombs and rain ice shards on them.
  • Stops firing frost bolts but fires bursts of ice shards far more frequently.

Phase 5[edit | edit source]

  • Transitions at 32% health.
  • Cryogen chases the player.
  • Stops firing ice shards but resumes firing star-shaped barrages of frost bolts.
  • Continues to periodically release ice bombs.
  • Every few seconds, Cryogen will teleport somewhere near the player and start attacking again. It is intangible and cannot hurt the player while teleporting.
  • Loses the ability to regenerate its ice shield to prevent cheap hits.

Phase 6[edit | edit source]

  • Transitions at 15% health.
  • The status message "Cryogen is derping out!" will appear in the chat, and Cryogen will visually shatter and take on a new appearance.
  • Cryogen will suddenly pick up speed and begin charging erratically, attempting to ram the player.
  • Stops firing frost bolts but continues to release ice bombs.
  • The rain/snow will stop when Cryogen is defeated.

In Expert Mode[edit | edit source]

  • Cryogen gains massive attack and defense boosts as health depletes.

In Revengeance Mode[edit | edit source]

  • Fires projectiles faster.

In Death Mode[edit | edit source]

  • Summons more minions in all phases.

Summons[edit | edit source]

Cryogen's Shield
Cryogen's Shield.png
Statistics
TypeEnemy
EnvironmentSnow Biome
AI TypeCryogen's Shield AI
Damage25 / 100 / 125
Max Life1400
Defense (DR)0 (40% DR)
KB Resist10%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration1.5 seconds
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1 second
Debuff tooltipYour movement speed has been reduced
Aurora Spirit
Aurora Spirit.png
Statistics
TypeEnemy
EnvironmentSnow Biome
AI TypeAncient Vision AI
Damage40 / 80 / 100
Max Life220 / 440
Defense 5
KB Resist100%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration1.5 seconds
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1 second
Debuff tooltipYour movement speed has been reduced
Cryocore
Cryocore2.png
Statistics
TypeEnemy
EnvironmentSnow Biome
AI TypeCryocore AI
Damage35 / 70 / 87
Max Life220 / 440
Defense 5
KB Resist25%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration1.5 seconds
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1 second
Debuff tooltipYour movement speed has been reduced
CryocoreBuffed
Cryocore1.png
Statistics
TypeEnemy
EnvironmentSnow Biome
AI TypeCryocore AI
Damage37 / 74 / 92
Max Life300 / 600
Defense 0
KB Resist50%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration1.5 seconds
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1 second
Debuff tooltipYour movement speed has been reduced

Aftermath[edit | edit source]

Notes[edit | edit source]

  • Cryogen will not cause it to rain/snow during the Boss Rush.

Tips[edit | edit source]

For more elaborate strategies on defeating Cryogen, including weapon and arena recommendations, see Guide:Cryogen strategies.
  • A wide arena with several levels of platforms can help with dodging its attacks. Putting in one or two minor platforms of solid blocks can help protect you and allow you to change direction when dealing with its second phase.
  • Moving slowly on a platform can help keep Cryogen above you, which can be useful for dealing quick damage with ranged weapons; make sure to have a way of dodging it when it comes too close.
  • Avoid being hit by Cryogen and its icicles at all costs, as the Glacial State inflicted by them could lead to the player becoming stunlocked and easy prey to Cryogen's attacks.
  • When playing on Revengeance or Death Mode, save Rage and/or Adrenaline for Cryogen's final stage to avoid its large collision damage.
  • The Butcher can quickly decimate Cryogen and its ice shield, keep in mind that the weapon has almost no knockback, making it a hassle to defeat Aurora Spirits and Cryocores.
  • Using the Crystal Storm or Relic of Ruin can deal great consistent damage to Cryogen.
  • A mix of Ancient Ice Chunk and the Queen Spider Staff can make great work of Cryogen but, keep in mind that summons won’t always attack Cryogen, instead opting to attack its summons instead.
  • Rogue weapons such as the Ichor Spear or Titanium Shurikens can deal good damage to Cryogen.
  • Weapons that inflict Armor Crunch such as the Earthen Pike, the Slag Magnum, and the Spear of Paleolith can be a vital tool during this fight.
  • The weapons found in the AbyssShadow Chest can still be a viable option to the player, despite that fact that they are pre-hardmode weapons.
  • Titanium armor is a good choice for this fight as it is a powerful asset for avoiding Cryogen's many projectiles with its set bonus.
  • The Warmth Potion grants immunity to Chilled, Frozen, and Glacial State in the Calamity Mod, making it a good tool for surviving Cryogen's debuffs.

Trivia[edit | edit source]

  • Cryogen's theme is Antarctic Reinforcement, which was composed by the artist DM DOKURO.
    • While in production the theme was originally intended to be called "Frostbite."
    • If the Calamity Music add-on mod is disabled, the Frost Moon's theme will play instead.
  • Since the Aquatic Scourge drops Souls of Sight, the Brimstone Elemental drops Souls of Fright and Cryogen drops Souls of Might, the Drax or Pickaxe Axe can technically be crafted as soon as you have defeated a Mechanical Boss, allowing you to utilize Chlorophyte on the other two.

Lore[edit | edit source]

Yharim's prison for the archmage of the ice castle, Cryogen. It is a representation of Yharim's bitter hatred for the master of ice. When Yharim was young he ventured from the jungle temple to the ancient tundra where Permafrost resided. Yharim asked to learn from him in order to "peacefully" calm the denizens of the underworld. But the archmage saw through his ruse and viewed only bitter contempt within Yharim's heart and the fiery urge to annihilate the underworld obsidian towers and their inhabitants. When the archmage refused Yharim took his leave, bowing to the archmage and returning to his home. However, the archmage had not realized that Yharim had a contingency plan in place; around his dwelling a massive trap had been set. A magic circle set to overload one’s power causing the user to lose control. Permafrost suspected nothing, until the moment in which his own spell caused his castle to collapse inwards, trapping his body in a radial structure. He had not given the Tyrant another thought. Cryogen is what remains, a mindless frozen structure that was contained afterwards by Yharim due to its uncontrollable nature and powerful magic.