Zorhanna's Simulacrum

The simulacrum has advantage on saving throws against spells and other magical effects.

The simulacrum can't regain expended spell slots or use the properties of the shard solitaire necklace. (The shard solitaire is currently attuned to the Far Realm entity trapped inside.) If the simulacrum drops to 0 hit points, it turns to snow and melts away, and the shard solitaire necklace teleports to the safe in Zorhanna's vault tower.

The simulacrum is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The archmage can cast disguise self and invisibility at will and has the following wizard spells prepared:

At will: disguise self, invisibility

Cantrips (at will): fire bolt, light, mage hand, prestidigitation, shocking grasp

Level 1 (4 slots): detect magic, identify, mage armor*, magic missile

Level 2 (3 slots): detect thoughts, mirror image, misty step

Level 3 (3 slots): counterspell, fly, lightning bolt

Level 4 (3 slots): banishment, fire shield, stoneskin*

Level 5 (3 slots): cone of cold, scrying, wall of force

Level 6 (1 slots): globe of invulnerability

Level 7 (1 slots): teleport

Level 8 (1 slots): mind blank*

Level 9 (1 slots): time stop

*The simulacrum casts these spells on itself before combat.

Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.