Imperious Darkside Mirror

Stealth

+32 (legendary) to notice that the mirror isn't a regular mirror

Disable

DC 42 Thievery (legendary) to retrieve a creature from the mirror within 10 minutes of the switch (possible only if their mirror duplicate is dead), DC 47 Thievery (master) to permanently disable the mirror once all mirror duplicates are dead, or dispel magic (9th level; counteract DC 40) to counteract the mirror for 1 minute and prevent additional replacements from appearing during that time.

AC 41, Fort +32, Ref +27

Hardness

1

HP

4 (BT 2); the mirror can't be damaged while any mirror duplicate is alive

Immunities

critical hits, object immunities, precision damage