You scales make have natrual armor

Ability score increase

Imunity 

Skills you know

Saves that leanrend form race

Senses

Language you learn

When the dragon rolls a Wisdom (Perception) check or saving throw against being blinded, deafened, frightened, stunned, or knocked unconscious, it rolls three dice and uses the highest result.

When two of the dragon’s heads are asleep, its other head is awake. And other is still conscious and can still see and hear things

You have natrual bite you make 3 for one attack action

You make a claw attack

The dragon exhales life-draining gas in a 60-foot cone. Each creature in that area must make a DC 21 Constitution saving throw, having their Constitution score reduced by 1d12 on a failed save, or half as much damage on a successful one. This reduction lasts until the affected creature takes a long rest. If a creature’s Constitution score reaches 0, they die. 

Each creature of the dragon's choice that is within 60 ft. of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Uses a breath charge roll 5-6 on d6 use it or breath again

The Dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The Dragon regains spent legendary actions at the start of their turn.