EastScape Wikibuilt from the game itself
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A party of 4 · its door is in The Undergate

The Hall of Mirrors

Four chambers, shut by three gates; the last opens at a lever. 3 tiers, the door at Combat 92, 98, 99.

Ways out
The Undergate (a path)
Guide
The Hall of Mirrors
TierDoorFight atAnteA clear pays
The Hall of MirrorsCombat 92Melee 1005,00059,000
The Glass MazeCombat 98Melee 1087,50075,000
The Queen's ReflectionCombat 99Melee 11810,00088,500
Who lives down here
Hunter's notes: The Mirror Queen
  • 80,000 health for two, more for a bigger party; hits up to 300, every 2.4 s.
  • The hoard: 5 to 9 rolls each, your own; the first is always the clear's tickets.
What you can use here

A chest.