The Twins

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Bio
The Twins are a Hardmode mechanical boss and are essentially a more difficult version of the Eye of Cthulhu. The Twins are two separate flying entities, Retinazer and Spazmatism, connected by a tendril, each with its own attack pattern and life count. Both must be killed in order to defeat the boss.
The Twins can be summoned manually using a Mechanical Eye at night (7:30 PM to 4:30 AM). They also have a 1/10 (10%) chance to spawn naturally at dusk once a Demon or Crimson Altar has been destroyed, as long as they have not yet been defeated at least once in the current world. If spawning this way, their arrival is announced by the status message "This is going to be a terrible night...".
The Twins must be killed before dawn, otherwise they flee and despawn.
Spawn Conditions

Queen Slime can be spawned in the Hallow by using a Gelatin Crystal—if used outside the Hallow, nothing will happen and the item will not be consumed. The crystal is consumed upon use, immediately summoning the boss.
The Gelatin Crystal can be found in the Underground Hallow among Crystal Shards growing on Pearlstone and Pink Ice blocks.


Stratigies
The Twins, as the name suggests, are two separate monsters, both of which must be defeated. They have a combined health of 43,000 / 64,500, shared between them. Retinazer is distinguished by its red iris and lasers, while Spazmatism can be identified by its green iris and cursed flames projectile.
When an Eye is reduced to 40% of their maximum health, it will transform, gaining a slight boost in offense and defense. Each Eye transforms independently once reduced to 8,000 / 12,000 HP (Retinazer) / 9,200 / 13,800 HP (Spazmatism); the other eye remains in its original form until it is reduced to the appropriate amount. When one is destroyed, the other will continue attacking in the same pattern.
It is a good idea to focus on one eye, since the fight becomes easier if a single eye has been defeated. Additionally, the fight becomes considerably harder if both eyes are on their second form.
Boss Specs
  • Retinazer:
  • First Form:
  • Damage 45 (melee) 40 (Eye laser)
  • Max Life 20000
  • Defense 10
  • Second Form:
  • Damage 67 (melee) 50 (Death Laser) 36 (Rapid Fire)
  • Max Life 8000/20000
  • Spazmatism:
  • First Form:
  • Damage 50 (melee) 50 (Cursed Flame)
  • Max Life 23000
  • Defense 10
  • Second Form:
  • Damage 75 (melee) 60 (Eye Fire)
  • Max Life 9200/23000
  • Defense 28
Drops
  • Coins 12 (Gold)
  • Soul of Sight 25-40 (100%)
  • Hallowed Bar 15-30 (100%)
  • Horned God Boots (14.29%)
  • Greater Healing Potion 5-15 (100%)
  • Twin Mask (14.29%)