Aurinoir Sentry

Magic Resistance: The Aurinoir Sentry has advantage on saving throws against spells and other magical attacks.

Evasion: When Aurinoir Sentry is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, instead it takes no damage if it succeeds and half damage if it fails.

Rapid Slash: If the Aurinoir Sentry has advantage on a High-Frequency Blade attack against a target, it can forgo the advantage and instead make an additional attack against the same target.

Immutable Form: The Aurinoir Sentry is immune to any spell or effect that would alter its form.

Multiattack: The Aurinoir Sentry makes two High-Frequency blade attacks and one Barbed Tail attack.

High-Frequency Blade: Melee Weapon Attack: Attack: +10 to hit, reach 5ft, one target. Hit: 13 (2d6 + 6) slashing damage and 7 (2d6) force damage. This attack ignores resistance to slashing damage and is considered magical.

Barbed Tail: Melee Weapon Attack: +10 to hit, reach 10ft, one target. Hit: 10 (1d6 + 6) piercing damage. If the target is a creature it must succeed a DC 18 Strength saving throw or be knocked prone.

 Move: The Aurinoir Sentry can take the Disengage action without provoking opportunity attacks.

Brace: The Aurinoir Sentry makes one Barbed Tail attack against a creature that comes within 10ft of it.

Defensive Acrobat: As a reaction to an attack that would hit the Aurinoir Sentry, it can make an Acrobatics check against the hit roll. If the result is higher the attack misses.