The Spirit Mod adds 8 new bosses to the game; 4 are fought pre-Hardmode, 3 are fought in Hardmode, and 1 is fought post-Moon Lord.
In Expert Mode, these bosses have more health and deal more damage. They also drop Treasure Bags, containing unique, Expert Mode-exclusive items.
Pre-Hardmode
Scarabeus
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Scarabeus is an armored scarab with 1,700 health (2,250 in Expert Mode) It tries to jump on you, and summons Scarabs to attack you. It can be summoned with a Scarab Idol anywhere, at any time. |
Moon Jelly Wizard
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 The Moon Jelly Wizard is a playful group of Moon Jellies with 1600 health (2560 in Expert Mode) that is intended to be fought after defeating the Eye of Cthulhu. It is summoned with a Dreamlight Jelly anywhere during the night. It rapidly dashes and dives at the player while casting various electric spells, as well as kicking out dreamlight bubbles and shooting Tiny Lunazoas at the player. Once defeated, the Moon Jellies hiding under its robes will flee as its hat falls to the ground. The Moon Jelly Wizard drops a variety of weapons and armor pieces themed around the spells it casts during its encounter. It also drops the Cornucop-ion in Expert Mode, a classless weapon which can charge lightning bolts to be cast unto nearby enemies for high damage. |
Vinewrath Bane
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Vinewrath Bane is an vine-clad monstrosity with 5,300 health (8,800 health in Expert Mode) split over both forms. It fires nature-like projectiles at the player. It has 3,200 health (5,440 in Expert Mode) in its first phase, and 2,100 health (3,360 in Expert Mode) in its second phase. It can be summoned with a Bramble Tooth in the underground Briar biome, during the day. |
Ancient Avian
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 The Ancient Avian is a skeletal harpy with 3,100 health (4,960 in Expert Mode) It flies above the player and fires projectiles at the player. It can be summoned with a Feather Crown around Floating Island heights or by breaking an Ancient Egg that spawns in the Avian Islands nest. |
Starplate Voyager
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 The Starplate Voyager is a galactic worm with 10,000 health (12,000 in Expert Mode) It fires electricity-themed projectiles at the player. It can be summoned with a Starplate Beacon at an Astralite Beacon in the Asteroid Fields. |
Hardmode
Infernon
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 Infernon is a infernal demon with 13,000 health (26,000 in Expert Mode) He is summoned by using a Pain Caller in The Underworld. Throughout the fight he flies above the player, rarely swooping down and firing projectiles. After half of its health, it summons the Infernus Skull. It then continues firing a variety of projectiles. Infernon drops weapons themed around fire and the underworld, as well as Torment Shards, which can be used to craft other items. It drops the Fiery Lash in Expert Mode, which causes enemies to be inflicted with On Fire! when you walk past them. |
Dusking
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 The Dusking is a nightmarish skull with 21,000 health (42,000 in Expert Mode). It attacks by moving towards the player while flinging many projectiles at them, including a minion, the Shadowflamer. He can be summoned with a Dusk Crown anywhere, at night. |
Atlas
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 Atlas is a colossal rocky creature with 41,000 health (69,700 in Expert Mode). It shoots projectiles and summons Cobbled Eyes as its health depletes. It can be summoned with a Stone Fist anywhere, at any time. |
Post-Moon Lord Bosses
Overseer
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 The Overseer is an amalgamation of spirits with 179,000 health (358,000 health) and is regarded as the most difficult boss in the Spirit Mod. It is summoned in the Spirit Biome at nighttime with the Spirit Idol. Upon spawning, the Overseer starts charging at the player while shooting an abundance of projectiles. Among these are Spirit Portals, which the Overseer teleports into a few seconds after they spawn, Core Shards, a projectile that merely float around, Haunting Wisps, a homing version of the Core Shards which chase after the player, after this, when the message: BEHOLD MY TRUE POWER pops up in the chat, the Spirit Portals change into Spirit Gateways which the Overseer summons Captive Spirits out of. The Overseer drops spirit-themed weapons and crafting materials, along with the Eternity Charm accessory in Expert Mode, which summons a group of Soul Shards when you are hit. |
Mini-Bosses
Beholder
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Beholder is an mini-boss that occasionally spawns in Marble Caves after Eater of Worlds or Brain of Cthulhu is defeated. It contastly flies around the player and dashes at them, upon contact it siphons the player's mana by 60 and inflicts the Bleeding debuff and it will randomly teleport and remain stationary while shooting ricocheting fireballs at them which inflicts the On Fire! debuff. |
Fallen Angel
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Fallen Angel is a holy angel that is found in Space in Hardmode. It attacks the player by flying and dashing at them four times, upon contact it inflicts the Cursed debuff in Expert Mode. After dashing, it releases a cluster of homing shooting stars at them. |
Glade Wraith
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Glade Wraith is an overgrown wraith that is summoned by destroying an Wildwood Altar or using a Glade Wreath found in Briar Chests or it can spawn naturally in the Briar. It attempts to fly towards them and began shooting leaves constantly and will occasionally stop and throw a barrage of Thorn Balls that bounce against tiles. |
Mechromancer
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Mechromancer is a mini-boss that is found during a Goblin Army after Eater of Worlds or Brain of Cthulhu is defeated. He walks towards the player and summons Coil Drones that descend slowly before exploding upon them and then he will fly above them with Rocket Boots while leaving behind damaging embers. After he is done flying, then he fires three homing rockets that inflicts the On Fire! debuff. |
Occultist
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Occultist is a undead necromancer that spawns during a Blood Moon. It summons Zombies and Blood Zombies simultaneously while occasionally summoning Dark Grasps that inflicts the Obstructed debuff. The enemies that were summoned has low health, it will kill one enemy at a time and heal 30 health for each one killed. |
R'lyehian
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 R’lyehian is a purple tidal spirit with 2,800 health (5,600 in Expert Mode). It flies and fires a multitude of projectiles. It spawns at the end of the Tide event in pre-Hardmode. |
Lavavent Elemental
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The Lavavent Elemental is a steamy spirit that flies and fires a multitude of projectiles. It spawns occasionally during The Tide after at least one of the Mechanical Bosses has been defeated. It has 7,000 health (14,000 in Expert Mode) and cannot be summoned manually. |
Snow Monger
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 The Snow Monger is a enormous robotic miniboss controlled by a Snowman that spawns during the Frost Legion. It floats towards the player, shooting ice blasts, snowballs and ice beams, as well as summoning Snowman Gangstas. It has 4500 health (9000 in Expert Mode) and cannot be summoned manually. |
Boss Progression
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