Arcanist

Spellcasting. The acolyte is a 3rd-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 13, +5 to hit with spell attacks). The arcanist has following wizard spells prepared:

Cantrips (at will): light, mage hand, message, minor illusion

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

2nd level (2 slots): invisibility, mirror image

Astral Self. The Arcanist can create a magical copy of itself. This copy has the same movement speed as the caster and the caster can see the area around the copy. The spell requires concentration and the copy disappears if concentration is broken. It does not take damage from spells or abilities.  

Mystic Militartum. The Arcanist can use its intelligence for weapon attacks. Attacks with the Astral blade are considered magical.

Multiattack. The Arcanist makes two weapon attacks with its Astral blade

Astral Blade. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage.

Astral Projection (Recharge 5-6). The Arcanist uses its astral self ability and may move it at any time on its turn. 

Astral Displacement. The Arcanist can switch places with its Astral Self. If the Astral Self is within 5ft of a creature, the Arcanist can make an opportunity attack against it.