OSTO features 25 World Bosses (WB) scattered across Arborea. This guide outlines their locations along with the most efficient ways to reach them.

World Boss hunting is primarily achievement-driven, with objectives found in the Encounters and Exploration section of the Achievements window (default key: “V”). Completing these achievements provides a natural, goal-driven way to explore the world while steadily introducing new challenges. While some WBs are easily soloable, others may require a group—even for players in max-level gear.

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Note: World Bosses spawn on independent timers, so not all bosses are available at the same time. After a server reset, all bosses are reset, creating a window to complete a full rotation efficiently before their timers start to desynchronize.

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Abraxis

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Respawn Timer: 6-24 hours

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Location: Southern Arun → Ostgarath → Mistmoor Island → Rain Cages Teleport Routes:

  1. Fane of Kaprima Entrance
  2. Cutthroat Harbor → Vindicator Basecamp

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Andras

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Respawn Timer: 6-24 hours

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Location: Southern Arun → Ostgarath → Mistmoor Island → Rain Cages Teleport Route: Tralion → Seeker’s Locus

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Arakia

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Respawn Timer: 6-24 hours

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