Cryogen

Cryogen

Statistics

Type	Boss
Environment	Snow Biome
AI Type	Cryogen AI
Damage	60 / 96 / 120 / 138 (Contact) 46 / 80 / 92 (Frost bolt) 52 / 92 / 106 (Ice shard) 44 / 88 / 110 / 126 (Ice bomb)
Max Life	17,900 / 28,640 / 42,080 / 63,840
Defense (DR)	10 (10% DR)
KB Resist	100%
Inflicts debuff	Frostburn 100% chance
Debuff duration	2 seconds (Contact and Ice bomb) 1.5 seconds (Frost bolts) 1 second (Ice shards)
Debuff tooltip	It's either really hot or really cold. Either way it REALLY hurts
Inflicts debuff	Chilled 100% chance
Debuff duration	1.5 seconds (Contact and Ice bomb) 1 seconds (Frost bolts) 0.5 second (Ice shards)
Debuff tooltip	Your movement speed has been reduced
Inflicts debuff	Frozen 100% chance
Debuff duration	0.5 seconds (Frost bolts)
Debuff tooltip	You can't move!
Immune to	All debuffs except:

Drops

Coins	10

• Item (Quantity)Rate
• Soul of Might (20-40 / 25-40)
  100%
• Frigid Bar (15-24)
  100%
• Essence of Eleum (4-8 / 5-9)
  100%
• Frost Core
  100%
• Bittercold Staff
  25% / 33.33%
• Effluvium Bow
  25% / 33.33%
• Glacial Crusher
  25% / 33.33%
• Icebreaker
  25% / 33.33%
• Ice Star (100-150 / 150-200)
  25% / 33.33%
• Avalanche
  25% / 33.33%
• Snowstorm Staff
  25% / 33.33%
• Regenator
  2.5%
• Cryo Stone
  10%
• Frozen Key
  20%
• Greater Healing Potion (1-15)
  100%
• Cryogen Mask
  14.29%
• Cryogen Trophy
  10%
• Cryogen (Lore)(Always on first kill)
  100%
• Treasure Bag(Cryogen)

  • Soul of Cryogen

  • Frost Flare(In Revengeance Mode only)

  100%

Map Icon

"The ancient ice spirits have been unbound!"

Cryogen is a Hardmode boss fought in the Snow biome.

Spawn

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

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

Phase 1

• 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.
  • The ice bombs inflict Glacial State for 1 second, Chilled for 1.5 seconds, and Frostburn for 2 seconds on contact.

Phase 2

• 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

• 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

• 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

• 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

• 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

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

In Revengeance Mode

• Fires projectiles faster.

In Death Mode

• Summons more minions in all phases.

Summons

Cryogen's Shield Statistics Type Enemy Environment Snow Biome AI Type Cryogen's Shield AI Damage 25 / 100 / 115 (Contact) 46 / 80 / 92 (Frost bolts) Max Life 1400 Defense (DR) 0 (40% DR) KB Resist 10% Inflicts debuff Frostburn 100% chance Debuff duration 1.5 seconds Debuff tooltip It's either really hot or really cold. Either way it REALLY hurts Inflicts debuff Chilled 100% chance Debuff duration 1 second Debuff tooltip Your movement speed has been reduced

Aurora Spirit Statistics Type Enemy Environment Snow Biome AI Type Ancient Vision AI Damage 40 / 80 / 92 Max Life 220 / 440 Defense 5 KB Resist 100% Inflicts debuff Frostburn 100% chance Debuff duration 1.5 seconds Debuff tooltip It's either really hot or really cold. Either way it REALLY hurts Inflicts debuff Chilled 100% chance Debuff duration 1 second Debuff tooltip Your movement speed has been reduced

Cryocore Statistics Type Enemy Environment Snow Biome AI Type Cryocore AI Damage 35 / 70 / 80 Max Life 220 / 440 Defense 5 KB Resist 25% Inflicts debuff Frostburn 100% chance Debuff duration 1.5 seconds Debuff tooltip It's either really hot or really cold. Either way it REALLY hurts Inflicts debuff Chilled 100% chance Debuff duration 1 second Debuff tooltip Your movement speed has been reduced

CryocoreBuffed Statistics Type Enemy Environment Snow Biome AI Type Cryocore AI Damage 37 / 74 / 85 Max Life 300 / 600 Defense 0 KB Resist 50% Inflicts debuff Frostburn 100% chance Debuff duration 1.5 seconds Debuff tooltip It's either really hot or really cold. Either way it REALLY hurts Inflicts debuff Chilled 100% chance Debuff duration 1 second Debuff tooltip Your movement speed has been reduced

Aftermath

• Once Cryogen is defeated for the first time, Cryonic Ore spawns in the Underground Snow biome.
• Cryo Slimes will begin to spawn in the Cavern layer.
• 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 Angry Dog enemy's stats are increased.
• The Wizard will begin selling Cryo Keys.

Notes

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

Tips

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 Abyss’ Shadow 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.
  • An Ankh Shield can also grant immunity to Chilled.

Trivia

• 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.
• Cryogen is an Alternative Mechanical boss because of its ability to drop Souls of Might. The Aquatic Scourge and Brimstone Elemental drop Souls of Sight and Souls of Fright respectively, meaning the Drax or Pickaxe Axe can be crafted after defeating only one Mechanical Boss, allowing the player to utilize Chlorophyte and Unholy Cores on the other two.

Lore

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.