Calista Shadowbrook - Eye of the Maimed God

Magic Resistance. The Eye of the Maimed God has advantage on saving throws against spells and other magical effects.

Spellcasting. The Eye of the Maimed God is a 19th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The Eye of the Maimed God  can cast disguise self and invisibility at will and has the following wizard spells prepared:

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

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

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

3rd level (3 slots): counterspell, fly, lightning bolt

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

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

6th level (2 slot): create undead,  eyebite, soul cage

7th level (1 slot): teleport

8th level (1 slot): mind blank*

9th level (1 slot): time stop

*The Eye of the Maimed God casts these spells on itself before combat.

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

Warcaster.  When able to make an attack of opportunity, the Cult Lieutenant can cast a spell as a reaction instead of making a melee attack.