Rune of Kos bosses

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The Rune of Kos bosses are 3 post-Moon Lord bosses that are all summoned with the Rune of Kos. Each boss will drop a key crafting material needed to craft a Cosmic Worm, which is used to summon The Devourer of Gods.

The item used to summon the bosses, the Rune of Kos, can be crafted before defeating Providence, the Profaned Goddess, but it is also dropped by her when defeated for the first time.

The locations to summon the bosses are as follows:

Boss Spawn Area Key Material Drop
Storm Weaver Storm Weaver SpaceSpace Armored ShellArmored Shell
Ceaseless Void Ceaseless Void DungeonDungeon Dark PlasmaDark Plasma
Signus, Envoy of the Devourer Signus, Envoy of the Devourer The UnderworldThe Underworld Twisting NetherTwisting Nether

Trivia

  • The Rune of Kos bosses' theme is Servants of the Scourge, which was composed by the artist DM DOKURO. The theme splits to 3 types for each boss: Storm Weaver (Type W), Ceaseless Void (Type V) then Signus (Type S), respectively.
    • This theme contains a motif from The Devourer of Gods' theme.
  • The Rune of Kos bosses were at one point collectively referred to as the Sentinels of the Devourer.
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Pre-Hardmode King Slime (Jewels) • Desert Scourge (Desert Nuisance) • Eye of Cthulhu (Bloodletting Servant) • Crabulon (Crab Shroom) • Eater of Worlds • Brain of Cthulhu • The Hive Mind (Dank Creeper • Hive Blob • Dark Heart) • The Perforators • Queen Bee • Deerclops • Skeletron • The Slime God (Corrupt Slime Spawn • Crimson Slime Spawn • Crimson Slime Spawn (spiked)) • Wall of Flesh
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Post-Moon Lord Profaned Guardians (Profaned Rocks) • Dragonfolly (Draconic Swarmer) • Providence, the Profaned Goddess (Profaned Guardians) • Rune of Kos bosses (Storm Weaver • Ceaseless Void (Dark Energy) • Signus, Envoy of the Devourer (Cosmic Lantern • Cosmic Mine)) • Polterghast (Phantom Spirit • Phantom • Polterghast Clone) • The Old Duke (Sulphurous Sharkron • Tooth Ball) • The Devourer of Gods (Cosmic Guardian) • Yharon, Dragon of Rebirth • Exo Mechs (XS-01 Artemis • XS-03 Apollo • XM-05 Thanatos • XF-09 Ares) • Supreme Witch, Calamitas (Sepulcher • Catastrophe • Cataclysm • Soul Seeker)
Hidden Boss Primordial Wyrm • THE LORDE • XB-∞ Hekate • Supreme Alchemist, Cirrus
Mini Boss Armored Digger • Cloud Elemental • Colossal Squid • Cragmaw Mire • Earth Elemental • Eidolon Wyrm • Giant Clam (Clam) • Great Sand Shark • Mauler • Nuclear Terror • Plaguebringer (Plague Charger) • Reaper Shark
Critters
Terrestrial Androomba • Baby Flak Crab • Bloodworm • Nanodroid • Piggy • Repair Unit • Twinkler
Aquatic Baby Cannonball Jellyfish • Baby Ghost Bell • Sea Minnow
Friendly NPCs
Pre-Hardmode Bandit • Sea King
Hardmode Archmage • Drunk Princess
Post-Moon Lord Brimstone Witch
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