MIO: Memories in Orbit - Bosses
The major encounters of MIO: Memories in Orbit. The Vessel is guarded by eighteen bosses, several of them optional or hidden, and each one gates an ability, a key item or a route deeper into the ark. Entries here are the encounters that are documented by name in community boss lists and guides.
We are updating the data
These pages are being expanded and corrected right now, so some entries may be
incomplete or out of date. Check back soon for the full dataset.
of 11 entries
· updated 2026-09-15
| Name | Type | Description | Faction | Abilities | Source | Rewards |
|---|---|---|---|---|---|---|
| Egis | Boss | The first boss most players meet and the encounter that sets the tone for the game's combat: tight arenas, readable telegraphs and a punish window that has to be earned with the dash and the deflect rather than traded blow for blow. | The Vessel | Arena-bound melee patterns Punishes greedy follow-ups | Opening stretch of the Vessel | — |
| Crow | Boss | An early Vessel guardian fought before the map begins to branch widely. | The Vessel | Multi-phase attack pattern | Early Vessel areas | — |
| Flora | Boss | A plant-like guardian and one of the opening trio of named bosses. | The Vessel | Area denial Summoned growths | Early Vessel areas | — |
| Acat | Boss | A mobile boss that closes distance quickly and forces MIO to use vertical space. | The Vessel | Fast closing attacks Aerial pressure | Early to mid Vessel | — |
| Calderon | Boss | A heavier guardian encountered once the Vessel's industrial sections open up. | The Vessel | Wide sweeping attacks Heavy armour and stagger resistance | Mid-game Vessel | — |
| Atmos | Boss | One of the mid-game bosses listed in the standard eighteen-boss order. | The Vessel | Environmental hazards Ranged pressure | Mid-game Vessel | — |
| Nabuu | Boss | A late addition to the main boss order and one of the encounters that guards the deeper layers of the ark. | The Vessel | Aerial arena pressure | Deeper Vessel layers | — |
| Sawlong | Chase Boss | A chase-sequence boss rather than a stand-and-fight duel: Sawlong pursues MIO through the Refinery, and the encounter is won by routing through the area cleanly instead of trying to out-damage it. | The Vessel | Sustained pursuit through the Refinery Destroys the terrain behind MIO | Refinery, east of the Vaults Network | — |
| Ati | Boss | A tendril-based boss fought at Noden, the Spine's shell, and the encounter tied to the Spine region of the Vessel. | Noden | Tendril grapples to energy anchors Hairpin Blast | Noden, the Spine's shell | Noden's Voice |
| Ancile & Targa | Duo Boss | A paired encounter listed among the eighteen bosses. | The Vessel | Two-opponent arena pressure | Vessel guardian encounter | — |
| AnRa & Dr. Halyn | Duo Boss | A two-part set piece rather than a straightforward duel. | Dr. Halyn | Multi-stage scripted encounter AnRa thrown as a projectile | Dr. Halyn's storyline encounter | — |
No matching entries
Try a different search term.