Mother Ash can cast druid spells up to sixth level, using her WIS. She has a spell save DC of 18 and her spell attacks have a +10 bonus.

Change Shape. Take on the form of a Firbolg (size medium), a cardinal (size small), or a monarch butterfly (size tiny).

Shatter. Select an point that you can see within 60 ft.. Within a 10 ft. diameter, creatures must make a DC18 CON save or take 6d10 Force damage, and be moved up to 15 ft. to the area's centre. Targets take half damage on a success and are not moved.
Cure Wounds. Touch a creature and heal them for 4d8+5 HP.
Crackling Bolt. Ranged spell attack, range 120 ft.. To hit: d20+10 , on hit: 4d10 Lightning.
Telekinesis. Pick a loose object or creature that you can see within 60 ft. that is Large in size or smaller. If a creature, the target must make a STR save or be moved up to 30 ft. in a direction that you choose. Objects fail the save automatically.

Shatter. Select an point that you can see within 60 ft.. Within a 20 ft. diameter, creatures must make a DC18 CON save or take 8d8 Thunder damage. Targets take half damage on a success and are not moved.

Gate Seal. Neutralise all interplanar gates in a 60 ft. cube that you can see for the next 24 hours.

Gravity Sinkhole. Select an point that you can see within 60 ft.. Within a 10 ft. diameter, creatures must make a DC18 CON save or take 6d10 Force damage, and be moved up to 15 ft. to the area's centre. Targets take half damage on a success and are not moved.

Torrential Rain. Summon down a deluge of rain in a 60 ft. radius of you that lasts 2d10 minutes. While active, all active fires in the area are put out, all allies in the area are healed 5 HP at the start of every round, and all enemies have the lightning damage done to them increased by 2d8 .
Disintegrate. Fire a magical projectile at a creature that stretches the fabric of its reality. The target must succeed a DC18 DEX save or take 8d10+40 Force damage. If the target is reduced to 0HP by this spell, they are reduced to a pile of dust. If the target is an object, they fail the saving throw automatically.

Amphibious. The dragon can breathe air and water.

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

Blooded. Ashur has seen terrible battle, and knows her time is coming. Her hit points are capped at 64, though her rend attacks are always made with advantage.