Antimagic Susceptibility. The armor is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the armor must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.

False Appearance. While the armor remains motionless, it is indistinguishable from a normal suit of armor.

Revenant Strike. When the Vengeful Vanguard is reduced to 0 hit points, instead it drops to 1 hitpoint and makes two slam attacks against each creature within 5 feet. It can only activate this trait once.

Tactical Mind (Recharge 5).
The Vengeful Vanguard can use its Tactical Mind once per turn, granting it advantage on one attack roll, ability check, or saving throw. This ability can be used as a reaction when an enemy within 30 ft. makes an attack.

Fury of the Vanguard (1/Day).
As a bonus action, the Vengeful Vanguard enters a state of heightened aggression. For the next minute, it can make an additional melee attack on each of its turns.

Multiattack.
The Animated Vengeful Vanguard makes two melee attacks.

Vanguard Strike.
Melee Weapon Attack: +5 to hit, reach 5 ft., one target.
Hit: 12 (2d6 + 3) slashing damage.

Tactical Assault (Recharge 5-6).
The Vengeful Vanguard can make a special attack where it calls a tactical command, allowing it to make a melee attack against each enemy within 10 feet of it. Each target must succeed on a DC 14 Dexterity saving throw or take 9 (2d6 + 3) slashing damage on a failed save, or half as much on a successful one.

Counterattack.
When a creature within 5 feet of the Vengeful Vanguard hits it with a melee attack, the Vanguard can use its reaction to make one melee attack against that creature.