End of Abyss Vaults and Sealed Areas Guide

End of Abyss is a Metroidvania, which means sealed areas are progression gates rather than decorations. A sealed hatch you cannot open today is a destination for later, once you have the right tool, and the game's map marks these spots so you can plan returns. Learning to read those marks is the core exploration skill: spot the seal, note the requirement, and come back equipped instead of banging your head against a door you cannot open yet.

Sealed hatches are marked by three yellow lights, with a map socket symbol showing the same marker, and they need the Grappling Hook to open. The Grappling Hook itself comes from the Containment Sector, so that sector is a priority once you start hunting sealed areas. Once you have the hook, revisit the marked hatches you passed earlier, since each one opens a new pocket of the world that was closed before.

Vaults follow a different chain: optional bosses grant Vault Keys, which means vault access rewards players who take on fights they could skip. If you only fight required bosses, vaults stay shut, so treat optional bosses as keys in their own right. Each vault you open with a key adds resources or rewards to your run, making the detour worth it for players who want the full map rather than the fastest route.

The Reactor security system is disabled from a B3 terminal during the Reactor Core objective, which itself involves three Power Cells, tying the Reactor area into the same progression logic as the rest of the game. Beyond that, eight Data Storage Units scattered across sectors unlock the secret ending, giving completionists a long tail of collecting to chase. The pattern is consistent throughout: tools open hatches, bosses open vaults, and thorough sector coverage opens the secret ending.

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