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Repentance · Combat rooms

Mega Satan Arena

The large sealed door on the final main-route floors leads to an optional ending boss.

Entry / cost at a glanceBoth Key Pieces or an alternate door opener

Recognize the entrance

What the doorway looks like

The oversized golden door appears in the Chest or Dark Room starting room.

Large golden gate

Mega Satan Arena: Large golden gate, sealed
Sealed
Mega Satan Arena: Large golden gate, open
Open

Original game-art examples, shown facing upward where relevant. Door textures and appearance can vary with the floor or item effects.

Find the entrance

How to enter Mega Satan Arena

Open the door in the starting room of the Chest or Dark Room with both Key Pieces, or an effect such as Dad's Key.

What you can find

Rewards and opportunities

The Mega Satan encounter, completion mark, and associated character rewards.

Mega Satan route requirements

Before you commit

The risk to plan around

Opening the gate consumes the two Key Pieces. Prepare before committing to the encounter.

  • Normal Key Pieces come from fighting the angels inside Angel Rooms.
  • This arena is separate from the floor's usual ??? or Lamb boss room.

Useful connections

Items that affect this room

Key Piece 1familiarKey Piece 2familiarDad's Keyactive

Reference

Repentance rules and room variants

This guide describes the room type. Exact layouts and contents can vary. The rules use Repentance references; Repentance+ can change them.

Room reference