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

Animated Resilience. If the Animated Armor Boss takes 15 or less damage from a single attack or spell, it instead takes no damage.

Bound Guardian. If the creature wielding Zarathustra is reduced to 0 hit points, the Animated Armor Boss becomes hostile to all creatures. Until a new creature attuens to the sword.

Protector of Zarathustra.
The Colossus gains advantage on attack rolls made to protect the wielder of Zarathustra. It can take the Dodge or Disengage action as a bonus action when within 30 feet of Zarathustra’s wielder.

Titanic Strength.
The Colossus has advantage on Strength-based checks and saving throws, and can use its Strength modifier for weapon damage rolls, increasing damage by +2.

Unyielding Colossus.
When the Colossus is reduced to half of its hit points or fewer, it gains resistance to all damage except force and psychic damage for 1 minute.

Multiattack.
The Zarathustra’s Bound Colossus makes three melee attacks.

Colossal Cleave.
Melee Weapon Attack: +14 to hit, reach 10 ft., one target.
Hit: 40 (6d8 + 8) slashing damage.

Earthquake Slam (Recharge 5-6).
The Colossus strikes the ground with Zarathustra, causing a tremor in a 30-foot radius. All creatures within the area must make a DC 19 Dexterity saving throw or take 50 (8d10) bludgeoning damage and be knocked prone. On a successful save, creatures take half damage and are not knocked prone.

Zarathustra's Fury.
Once per turn, the Colossus can use its bonus action to make an additional melee attack against a creature within 5 feet of the wielder of Zarathruster. This attack deals an extra 10 (2d6) slashing damage.

The Zarathustra’s Bound Colossus can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Colossus regains spent legendary actions at the start of its turn.

• Move. The Colossus moves up to half its speed without provoking opportunity attacks.
• Smash. The Colossus makes one Colossal Cleave attack.
• Defensive Shield. The Colossus gains +5 to AC until the start of its next turn.