Calamity Mod Wiki
Event Horizon
  • Event Horizon.png
Stack digit 1.png
TypeWeaponCrafting material
Damage275 Magic
Knockback3.5 (Weak)
Critical chance4%
Use time32 Slow
TooltipNothing, not even light, can return.
Fires a ring of stars to home in on nearby enemies
Stars spawn black holes on enemy hits
Inflicts DebuffDaybrokenDaybroken
100% chance

Debuff duration2 seconds (Star)
3 seconds (Blackhole)
Debuff tooltipIncinerated by solar rays
RarityRarity Level: 14
Sell 28 Gold Coin.png
Projectiles created
Event Horizon Star
Event Horizon Star
Event Horizon Blackhole
Event Horizon Blackhole

The Event Horizon's homing and orbiting stars. Notice how the stars spawn black holes when contacting the Target Dummies and the Super Dummy.

The Event Horizon is a craftable post-Moon Lord spell tome that is the direct upgrade to the Relic of Ruin. It fires a ring of stars around the player that orbit their location at the time it was used, and home in on nearby enemies. If no enemies are nearby, the stars expand outwards, go back inwards again and finally drift off. Upon contact with enemies, they transform into lingering black holes with half damage and infinite piercing, rapidly dealing damage while stationary before dissipating after 1.5 seconds.

Its best modifier is Mythical.



Crafting Station
Nuclear FuryNuclear Fury1
Relic of RuinRelic of Ruin1
Cosmilite BarCosmilite Bar8
Darksun FragmentDarksun Fragment8
Event HorizonEvent Horizon1

Used in[]


  • The event horizon is the area around a black hole where gravity becomes so strong that it is impossible for any matter or energy to escape, including light. This is referenced in the item's tooltip.
  • The weapon is a reference to the spell card, Black Magic "Event Horizon", used by the character Marisa Kirisame from the Touhou Project series.