In this video, Cutedog_ gets the near perfect sanctum run and gets a mirror doubled into a mirror of fortune into a sacred mirror for a total of 8 mirrors total.

The build used in this video was Charge Stacking Discharge with Ralakesh Impatience Boots Weapon Swap but as of 3.23 they changed the boots to no longer work like this.

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Relic Setup 0:00
Floor 1 0:20
Floor 1 Boss 2:30
Floor 2 2:40
Floor 2 Boss 4:45
Floor 3 4:58
Floor 3 Boss 7:26
Mirror Discover 7:53
Strategic Planning 9:00
Floor 4 9:16
THE Merchant 11:50
Floor 4 Continued 13:07
Lycia Phase 1 14:00
Lycia Phase 2 14:30
8 Mirror Reveal 14:47