Overwhelming Size. Due to extreme size and weight of the Zu, it tramples over creatures that are large in size or smaller when it enters it's space. The trampled creature must roll a DC 16 Dexterity saving throw, or take 3d100 bludgeoning damage and become incapacitated for 5 minutes. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Or take no damage and preventing the incapacitated effect on a success.

 Fly. The four wings of the Zu allow it to fly rather fast and effectively for its size. When it starts to fly, it creates huge gusts of wind, adding up to updrafts which is helpful for takeoff. Any creature caught within a 100 ft. radius of the huge gusts of wind must roll a DC 19 Strength saving throw, or get thrown 50 ft. and take 1d8 bludgeoning damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must succeed on a DC 18 Dexterity saving throw or take the same damage and be thrown back half of the distance. Or take half damage and resist the winds on a success.

Peck. The size of the Zu's beak is roughly 12 ft. and is harder than steel. When the Zu pecks at it's target from 30 ft. away, the creature must roll a DC 16 Dexterity saving roll, or take 1d100 bludgeoning damage. Or take half damage on a success. (Hit on attack: 24)

Bite. Many giant 1 foot needles for teeth can slice through thick metal and flesh with ease. Once Zu bites at its frontal target 30 ft. away, the creature must roll a DC 20 Dexterity saving roll, or take 1d100 piercing and 2d20 bludgeoning damage and become paralyzed for a round on a failure. Or take half damage and preventing the paralyzed effect on a success. (Hit on attack: 26)

Talons. The size of its talons are larger than an entire human being, being around 7 feet long. When the Zu scratches at it's target, the creature must roll a DC 15 Dexterity saving throw, ot take 5d20 slash damage. Or take half damage on a success. (Hit on attack: 20)

Multi-attack. Zu would make 2 Peck attacks and a Bite attack all in one action. The Zu can use this once per 3 turns.

Thundering Roost. The huge lungs of the Zu are the size of a large cottage, and that's each lung, so releasing all that air would result in an echoing boom. All creatures within 500 ft. from the Zu must make a DC 25 Constitution saving throw, or take 2d12 thunder damage along with being deafened, frightened and stunned for 2 rounds on a failure. Or take half damage and preventing the effects on a success.

Feather Spacing. The Zu's large feathers of the Zu are light and flexible, while also being strong and un-do'ing. And with many strong muscles where the feathers are held, it allows them to move around a bit, to help with aerial control. When a medium sized creature or smaller hits it both with a melee weapon or unarmed, the muscles would align and angle outwards, the creatures within the range of 10 ft. of the Zu must a DC 15 strength saving roll, or the creature takes 1d4 bludgeoning damage and push the creature back up to 15 ft, or take half damage and withstand the feathers.

Legendary Resistance (3/Day). If the Zu fails a saving throw, it can choose to succeed instead.

Lightning Storm Breath.(Cost 3 actions) The Zu would show it's judgement and fury towards those who appose it, it would fluff itself up and raise its head towards the sky, while opening its massive beak. After a few seconds, a massive storm cloud appears overhead, covering the entire sky with such electrical energy. After a few moments, a few bolts of lightning would strike into it's open beak one after the other, until it closes it's mouth and looks down at its target, and roars at it, shooting a massive blue and violet lightning beam. The creatures caught in a 2500 ft. straight line by 20 ft. in width, must roll a DC 28 Dexterity saving roll, or the creatures take 3d100 lightning and 3d20 force damage and become paralyzed for 10 minutes on a failure. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Or take half damage and preventing the paralyzed effect on a success.

Hurricane Flap.(Cost 2 actions) The unimaginably large wings of the Zu are great at two things, flying and pushing away anything it dis-values. Any creature caught in the 300 ft straight line by 100 ft. width, must roll a DC 24 Strength saving roll,  or get thrown 100 ft. and take 1d8 bludgeoning damage for every 10 feet it was thrown and will be prone. If the target is thrown at another creature, that creature must succeed on a DC 20 Dexterity saving throw or take the same damage and be thrown back half of the distance and will also be prone. Or take half damage while resisting the winds and preventing the prone effect on a success.

Orbital Dive-bomb (Cost 4 actions and requires the Zu to be flying at the height of at least 750 ft.) With the Zu circles it's prey beneath, it prepares to finish it off. It would dive-bomb at the unfortunate creature, making a falling noise similar to a large meteor. Any creature that is within the area (25ft. by 25ft.) of which the Zu lands must roll a DC 30 Dexterity, or the creature(s) die regardless on a failure. Any creature caught within a 75 ft. radius must roll a DC 25 Strength saving roll, or take 1d100 bludgeoning damage and be incapacitated for 10 minutes on a failure. Any creature within 125 ft. must roll a DC 20 Strength saving roll, or take 5d20 bludgeoning damage and be incapacitated for 1 minute on a failure. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.  Any creature within a 175 ft. radius must roll a DC 15 strength saving roll or take 1d20 bludgeoning damage and get knocked prone for a round one a failure. Or half damage and preventing the effects on a success. And no damage if the first one was a success. (The insta-kill move works on huge creatures or smaller. If it's gargantuan, it must roll a 6d100 roll for bludgeoning damage and Hit on attack is: 32)

Detect. The Zu makes a Wisdom (Perception) check.