Living Shadow. While in dim light or darkness, the dragon has resistance to damage that isn’t force, psychic, or radiant.

Shadow Stealth. While in dim light or darkness, the dragon can take the Hide action as a bonus action.

Sunlight Sensitivity. While in sunlight, the dragon has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 3 (1d6) fire damage.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage plus 2 (1d4) lightning damage.

Green Flame Breath (Recharge on a 6 or short rest). Exhales green fire in a 25-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking 56 (16d6) fire damage on a failed save, or half as much damage on a successful one.

Black Lightning Breath (Recharge on a 6 or short rest). Exhales black lightning in an 50-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.

Dark Matter Breath (Recharge on a long rest). Launch of ball of light drinking energy within 100-foot that strikes a 10-foot radius. Each creature in that area must make a DC16 Dexterity saving throw, taking 105 (10d20) necrotic damage on a failed save, or half as much damage on a successful one. This exhausts all of the dragons breath abilities until a short rest.

As an opportunity attack or retaliation to an offending action within 10 ft., the dragon may use a tail attack.

Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage plus 3 (1d6) lightning damage.