Astral Sentinel

Innate Spellcasting. The sentinel's spellcasting ability is Wisdom (spell save DC 14). It can innately cast the following spells, requiring no material components:

• At will: detect evil and good, detect magic
• 3/day each: dispel magic, hold person
• 1/day each: banishment, globe of invulnerability

Multiattack. The sentinel makes two melee attacks.

Greatsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 3) slashing damage.

Celestial Beam. Ranged Spell Attack: +5 to hit, range 120 ft., one target. Hit: 18 (4d8) radiant damage.

Healing Light (Recharge 5-6). The sentinel releases a burst of healing energy. All creatures within 30 feet of the sentinel, excluding undead and constructs, regain 15 (3d8 + 2) hit points.

Banishing Strike. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 3) slashing damage. If the target is a creature, it must succeed on a DC 14 Charisma saving throw or be banished to its home plane. If the target is native to the plane of existence you are on, the target disappears, returning to its home plane. If the spell ends before 1 minute has passed, the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.

Dimensional Ward (Recharge 6). The sentinel creates a protective aura that grants itself and all friendly creatures within 10 feet advantage on saving throws against spells and other magical effects. The aura lasts for 1 minute.

Astral Shift. As a reaction to taking damage, the sentinel can temporarily phase out of the current plane of existence, gaining resistance to all damage until the start of its next turn. It can use this feature once, regaining the ability after finishing a short or long rest.