Bosses
Shadows of Abaddon adds in 11 bosses, arranged with different attack patterns and loot. They all have their own trophies, masks and Treasure Bags to be claimed after they are slain.
Pre-Hardmode Bosses
The Decree
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 The Decree is a wolf-like boss with 2,000 (4,000) health in its first phase, and 1,250 (2,500) in its second. It can be fought by using a Frost Rune at any time in the Snow Biome, or can be found frozen in ice during a Blizzard post-Eye of Cthulhu. While it can be fought as the player's first boss, it is recommended to fight it post-Eye of Cthulhu, as its fast speed and deadly ice attacks can easily overwhelm a weaker player. The Decree will drop a couple pieces of Decree Fur upon defeat, which can be used to craft a set of weapons and armor. Its Expert mode drop, the Frigid Pendant, will turn the player into a Decree while in the snow biome, giving the player a stat boost as well. |
The Flaming Pumpkin
- For elaborate strategies on defeating The Flaming Pumpkin, including Weapon and Arena recommendations, see Guide:The Flaming Pumpkin strategies.
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 The Flaming Pumpkin is a Halloween-themed boss fought after the Queen Bee. It has 4,000 (8,000) HP in its first form, and (2,000) HP in its expert exclusive form. It is summoned anywhere at night with the Dread Lantern. It attacks by firing flaming seeds and other fiery projectiles. It drops Dread Flames, which are used to craft mid Pre-Hardmode weapons. Its expert accessory, the Pumpkin Amulet, fires 3 fireballs in random directions occasionally when the player is struck. |
Jensen, the Grand Harpy
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 Jensen, the Grand Harpy is the protector of the harpies and Raynare's sister. She has 6,000 (9,000) HP and is summoned using the Feather Talisman anywhere at night. She attacks by dashing and shooting feathers at players. Once she reaches 50% life, her spirit gets released and she gains multiple new attacks, such as her boomerang. She Drops Grand Harpy Feathers which are used to craft powerful late Pre-Hardmode weapons. Her expert accessory, the Flight Feather, is also very useful in the way that it negates fall damage from great heights. |
Hardmode Bosses
Araneas
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Araneas is a huge spider boss. She has 25,000 (50,000) health in and can be fought by breaking a Mysterious Egg found in Empress' Den. She attacks by shooting venom and webs, summoning spider eggs, and can crawl like a spider. She drops Venom Samples which are used to craft Venomite Bars along with Venomite Ores. Despite having Treasure Bag in Expert Mode, she does not have an exclusive item. |
Harpy Queen, Raynare
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Harpy Queen Raynare is the Queen of the Harpies. She has 45,000 (55,000) HP and is summoned using the Queen's Rose at night anywhere in the world. She attacks by shooting feathers, dashing and summoning Royal Harpies. She drops Royal Harpy Feathers which are used to upgrade the weapons made with The Grand Harpy's drops. Her expert item, the Royal Guard, is a useful defensive/offensive accessory. |
Primordia
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 Primordia is an Ancient pyramid-like boss. She has 55,000 (85,000) HP in it's first form and 45,000 (55,000) in it's second. She is summoned using the Forgotten Insignia anytime in a Desert biome. She will remain in that area and cannot move. She will begin attacking by firing solar and fiery projectiles. When her health reaches zero, she will break free and begin to fly around above the player and fire more projectiles. She drops Primordial Runes which are used to craft Egypt-themed items. Her expert item, the Primordial Core, is a unique accessory that summons pyramid orbitals that fire shots at nearby enemies. |
Post-Moon Lord Bosses
Abaddon, the Source of the Affliction
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 Abaddon, the Source of the Affliction, is the incarnation of fear, being able to teleport and create nightmares. This boss has 300,000 (400,000) HP and is summoned anywhere at night using the Nightmare Catcher. Killing him will cause Oblivion Shards to spawn in the underground and will award the player the Souls of Midnight. His expert drop is a unique melee weapon called Forged Fury. |
Araghur, the Flare Serpent
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 Araghur, the Flare Serpent is the corrupted guardian of the Flame Razed Forest. He has 500,000 (600,000) HP and is summoned in his biome at night by using a Thermal Flow Emitter. He attacks by shooting fireballs and summoning Flare Orbiters. He also has a second phase which gains him a shooting haste, makes his head the only vulnerable area, and summons Serpentlings, Dark Serpent Sigils and Serpent Fire Mist to rain on players. Killing him will spawn Flarium Crystals in the underground and reward Vials of Fiery Blood. His expert item, the Serpent Sceptre is a very useful infinite flight mount. |
The Lost Siblings
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 The Lost Siblings are Soraniti that hail from Syrus' moon, Soran. They fell into a rift created by Abaddon, and are desperately trying to find a way home. They feel a strong presence on Terraria's moon: an aura that feels familiar, though not quite... however, it is still enough to invoke Novaniel to seek it out. Upon defeat, they will drop Luminous Energy, which is used to upgrade the Moon Lord's drops. Their expert items are their respective weapons used in battle. |
Erazor
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 Erazor is a Sareliant from Syrus who started investigating when Abaddon created rifts to another world and threw other Syrusians into them. He is here to train the Terrarian to help him stop Abaddon's plans. Defeating him will reward the player the Asthraltite Plating used for buying powerful equipment. His expert drop is a unique accessory that changes the debuff inflicted on mages, the Arcanum of the Caster. |
Nihilus
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 Nihilus is an Expert Mode exclusive post-Erazor boss with 800,000 (1,000,000) HP and 1,200,00) (2,000,000) HP in its second phase. It is referred to by Erazor as "being". Defeating it will reward the player with Embers of Omen and Erosion Samples used for crafting weapons. Its expert drop is a unique accessory that gives you a special minion. It receives a stat boost after being defeated at least once in True Mode. |
Event Bosses
Zombie Piglin Brute
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 The Zombie Piglin Brute is a mini-boss that can be found during the Piglin Army event. |
Boss Progression
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