Calamity Mod Wiki
Saros Possession
  • Saros Possession.png
Stack digit 1.png
TypeWeaponCrafting material
Damage171 Summon
Knockback4 (Weak)
Use time9 Very Fast
TooltipGain absolute control over light itself
Summons a radiant aura
Consumes all of the remaining minion slots on use
Must be used from the hotbar
Increased power based on the number of minion slots used
Grants BuffSaros Possession (buff)Saros Possession
Buff tooltipA radiant aura protects you
RarityRarity Level: 14
Sell 28 Gold Coin.png
Projectile created
Radiant Orb
Radiant Orb
Summons Minion
Radiant Aura (minion)
Radiant Aura (minion).png

Saros Possession is a craftable post-Moon Lord summon weapon and the direct upgrade to Sirius. It summons a spinning radiant aura around the player that fires two homing flares towards enemies. Homing radiant orbs will occasionally be summoned from a random position near the aura, alongside a wave of three flares. Summoning the Saros Possession will consume all remaining minion slots, with the number of slots consumed increasing the damage of both the flares and the radiant orbs.

Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, minions cannot deal critical hits. The only lasting advantage a Mythical Saros Possession has over a Ruthless one is knockback.



Crafting Station
Cosmic AnvilCosmic Anvil
Cosmilite BarCosmilite Bar8
Darksun FragmentDarksun Fragment8
Saros PossessionSaros Possession1

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  • The player glows incredibly bright while the radiant aura is summoned.
  • When summoned, the minion's damage is multiplied by: log3 of the player's remaining minion slots, plus one. The damage value is rounded down to the nearest integer.
    • For example, if the player had 4 remaining minion slots when the item was used, the resulting base damage would be 963. 426 * (1 + log34) = 426 * 2.26186 = 963.55, rounded down.
    • After damage is calculated, the damage of the homing flare is further halved.
  • The minion's base damage is hard-capped at 10,000. However, this can only be achieved by having around 53 billion summon slots.
  • The speed of rotation is the amount of occupied minion slots multiplied by 0.85, plus 3, in radians per second.
    • For example, if the player had 4 remaining minion slots when the item was used, the resulting rotation speed is 6.4 radians per second, or 366.7 degrees per second. 3 + (4 * 0.85) = 3 + 3.4 = 6.4
  • The amount of frames taken to summon a radiant orb is equal to 0.9 to the power of the amount of minion slots occupied, multiplied by 130, and rounded to the nearest integer.
    • This number is capped at 7 frames, or at least 27 occupied minion slots. 130 * (0.9 ^ 27) = 130 * 0.05815 = 7.56, rounded down.


  • The sprites for both the staff itself and the minion it summons are references to The Radiance, a boss in the video game Hollow Knight.
  • A saros is a period of roughly 6,585 days, which can be used to predict eclipses.