Ancient Graviturgist

Spellcasting. The Graviturgist is a 9th-level spellcaster. Its spellcasting ability is Intelligence (save DC 14, +6 to hit with spell attacks). The Graviturgist has the following Wizard spells prepared:

Cantrips (at will): Blade ward, Sapping Sting, Ray of Frost, Prestidigitation
1st level (4 slots): catapult, magnify gravity, magic missile, shield
2nd level (3 slots): hold person, Immovable object
3rd level (3 slots): blink, pulse wave, slow
4th level (3 slots): gravity sinkhole, dimension door
6th level (1 slot): Gravity Fissure 

Gravity Pulse. The Graviturgist chooses one creature it can see within 60 feet of it, causing the target to be crushed by magical gravity. The target must make a DC 14 Constitution saving throw, taking 16 (3d10) force damage on a failed save, or half as much on a successful one. 

Reorient Projectile. If the Graviturgist is targeted by a ranged attack, it can alter the strength of gravity nearby, causing incoming projectiles to assume new trajectories. Until the start of its next turn, the Graviturgist has a +10 bonus to AC against ranged attacks.