Astral Brawler

Magic Resistance. The brawler has advantage on saving throws against spells and other magical effects.

Material Projection (1/day). While on the astral plane, the brawler can perform a 1 hour ritual to project itself onto the material plane. Its form on the material plane is tethered to its true form by a silvery cord. Its true form is unconscious while it is projecting in this way. This projection ends if the brawler’s form on the material plane is reduced to 0 hit points, if its true form takes any damage, if the brawler ends it as a bonus action, or if the brawler’s silvery cord is cut. When a creature using a magical melee weapon that deals slashing damage rolls a 20 on an attack roll against either of the brawler’s forms while it is projecting, it can cut the cord. The brawler must then make a DC 20 Constitution saving throw. On a successful save, the brawler’s true form awakens as normal. On a failed save, the brawler’s true form instantly dies.

Silvered Weapons. The brawler’s weapon attacks are silvered.

Multiattack. The brawler makes two weapon attacks.

Unarmed Strike. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 11 (1d10 + 6) bludgeoning damage plus 10 (3d6) force damage. On a critical hit against a target in an astral body (as with the astral projection spell), the brawler can snap the silvery cord that tethers the target to its material body, instead of dealing damage.

Flurry of Blows (Recharge 5-6). The brawler makes four unarmed strikes against a single target.