Evasion. If the nimblewright is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the save and only half damage if it fails, provided it doesn't have the Incapacitated condition.

Magic Resistance. The nimblewright has Advantage on saving throws against spells and other magical effects.

Multiattack. The nimblewright makes four attacks, using Halting Slam or Radiant Ray in any combination.

Halting Slam. Melee Attack Roll: +7, reach 10 ft. Hit:15 (2d10 + 4) Bludgeoning damage, and the target's Speed is reduced to 0 until the end of its next turn.

Radiant Ray. Ranged Attack Roll: +7, range 60 ft. Hit:14 (4d6) Radiant damage.