Force Storm Eye

Armor Class 19 · Hit Points 264 (16d20 + 96) · Speed 0 ft., fly 120 ft. (hover)

Air Form (Trait). The eye can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.

Flyby (Trait). The eye doesn't provoke opportunity attacks when it flies out of an enemy's reach.

Legendary Resistance (Trait). If the eye fails a saving throw, it can choose to succeed instead.

Siege Conditions (Trait). The eye deals double damage to objects and structures.

Multiattack (Action). The eye attacks twice with thunder slam.

Thunder Slam (Action). Melee Weapon Attack: +16 to hit, reach 20 ft., one target. Hit: 23 (4d6+9) sonic damage.

Lightning Storm (Action). All other creatures within 120 feet of the eye must each make a DC 20 Dexterity saving throw, taking 27 (6d8) lightning damage on a failed save, or half as much damage on a successful one. If a target's saving throw fails by 5 or more, the creature is also stunned until the end of its next turn.

Move (Legendary). The eye moves up to its speed.

Lightning Strike (Legendary). The eye can cause a bolt of lightning to strike a point anywhere under its storm. Each creature within 5 feet of that point must make a DC 20 Dexterity saving throw, taking 16 (3d10) lightning damage on a failed save, or half as much sonic damage on a successful one.

Screaming Gale (Legendary). The eye releases a blast of thunder and wind in a line that is 1 mile long and 20 feet wide. Objects in that area take 22 (4d10) sonic damage. Each creature there must succeed on a DC 21 Dexterity saving throw or take 22 (4d10) sonic damage and be flung up to 60 feet in a direction away from the line. If a thrown target collides with immovable object, such as a wall or floor, the target takes 3 (1d6) kinetic damage for every 10 feet it was thrown before impact. If the target would collide with another creature instead, that other creature must succeed on a DC19 Dexterity saving throw or take the same damage and be knocked prone.