Concordant Killer

Bound Weapons. The greatsword carried by the concordant killers dissipates into violet mist if dropped. The concordant killer can use a bonus action to reform the blade in its hand.

Neutral Balancer. When the concordant killer attacks a creature that is Neutral Good or Neutral Evil in alignment, its attacks have +3 to hit and deal +3 damage. If the concordant killer attacks a being with any other alignment other than Neutral Good, Neutral Evil, or Neutral, its attacks have have +10 to hit and deal double damage.

Protection From Evil and Good. Aberrations, celestials, elementals, fey, fiends, and undead have disadvantage on attack rolls against the concordant killer, and the concordant killer can’t be charmed, frightened, or possessed by creatures of these types.

Innate Spellcasting. The monster’s innate spellcasting ability is Charisma (spell save DC 21, +13 to hit with spell attacks). It can innately cast the following spells, requiring no material components:

• At will: Dispel Magic (6th level version), Magic Missile (6th level version), Resilient Sphere, Shield

• 6/Day: Banishment, Greater Invisibility, Plane Shift, Teleport, Wall of Force

• 2/Day: Forcecage, Mind Blank

Multiattack. The concordant killer can make two Concordant Greatsword attacks.

Concordant Greatsword. Melee Weapon Attack: +14 to hit, reach 5 ft., one creature. Hit: 30 (5d8 + 8) piercing damage. If the target is an aberration, celestial, elemental, fey, fiend, or undead, this attack deals an additional 22 (5d8) force damage.