Ancient Weapons. The zovvut's weapon attacks are magical.

Magic Resistance. The zovvut has advantage on saving throws against spells and other magical effects.

Multiattack. The zovvut makes 2 chain attacks and one cleansing burst attack or two chain attacks and one rain of blades attack.

Chain of Tharizdun. Melee weapon attack: +5 to hit, reach 30 ft., one target. Hit: 20 (3d8 + 7) slashing damage, and the target must succeed on a DC 20 Strength saving throw or be pulled up to 20 feet toward the zovvut and knocked prone. 

Cleansing Burst. The zovvut chooses a point within 60 ft. of it that it can see, and a supernova explodes in a 10 ft. sphere with the center on that point. All non-celestial creatures caught within the explosion suffer 25 (10d4) radiant damage and must succeed on a DC 15 Constitution saving throw or be blinded for 1 minute. 

Rain of Blades. The zovvut releases its metal scales in a 40 ft. cone. Each creature within the area must make a DC 15 Dexterity saving throw or take 20 (3d8+6) slashing damage. 

Possession (Recharge 5-6). The zovvut chooses a humanoid creature within 30 ft. that it can see and attempts to take over its body. The target has to succeed on a DC 18 Constitution saving throw or become possessed by the zovvut for 1d10 days before dying. Every day the possessed creature may attempt to stop the effect by rerolling the saving throw. On a success, it is indefinitely immune to the possession of this zovvut. 

Iron wings. When a creature makes an attack against zovvut archangel, the zovvut can use its reaction to increase its AC by 2 until the end of that creature's turn.