Celestial Plague

Ethereal Sight. The plague can see up to 3 miles into the Ethereal Plane when it is on the Material Plane, and vice versa.

Gaseous Existence.  The Celestial Plague does not have any real physical body and instead exists as a thick mist with a diameter of 120 feet, all creatures can move through the Celestial Plague

Undead Slayer. Any undead within the Plagues space automatically takes 3d10 force damage upon ending there turn there.

Drowning Breath.  The Plague can irradiate any part of itself with a minimum size of 5ft*5ft. A creature within this space takes 8d6 radiant damage + 3d10 force damage and must make a DC15 CON save or fall Prone on a failure and nothing on a success.

Thickening. Recharge(6(D6) The Plague loses its Gaseous Existence trait and becomes a semi liquid that begins to suffocate any creature within its space, no matter if they do not need to breathe or can breathe in water or other substances(Creatures can still hold their breath within the area). The thickening action acts as if the Plague is concentrating.

Gusty Blow. melee attack-5 feet The Plague slams a large portion of its mass at a target and moves 5 feet toward the creature(even if the creature is in the Plagues mass) and deals 3d8 bludgeoning damage and the creature must make a DC 17 Athletics check, on a failure the creature takes 2d6 force damage and pushed back 15 feet from the centre of the Plague on a success the creature is not pushed and take half damage.