Atmos the calm collector

Atmos can cast these spells 3/day: Haste, Blur, Blink, mirror image, counterspell. 

At will: Shape change

Atmos shape changes into a thin, sheepish, human with a black wide brim hat. long hair and a dark green tunic. (simple cloths) and a long grey coat. A ring a protection. among many other fine gemmed rings. 

Multiattack. The dragon makes three attacks: one with its bite and two with its claws. or cast a spell. 

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) lightning damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in an 60-foot line that is 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.

Can use a bonus action to take the dash action. 

Can use the rogues ability: Dodge (halving damage) & Evasion (on a dex save takes no damage).