Calaun Marux (the Vengeful Lightning)

Amphibious. You have exceptional lungs, allowing to breathe air and water.

Dragon tongue. Through mystical draconic magic, you can communicate with any inelligent creature. 

Dark Draconic inheritance. you're a draconic bloodline allows you to cast darkness 3 time per day in a 10-foot radius, regains all charges on a long rest.

Obsidian scales.Your natural Born scales are sharper than any other dragons, your scale's are like razor blades that is made out of obsidian glass, despite this fact your scales are one of the most sturdiest's of dragons and one of the most dangerous. If a Target successfully grapples you, The Target will take 1d4+ your dragon lvl of piercing damage, as the target gets cut on your scales. If a Target bites you or makes a natrual melee attack (fists,claws,ect), they will also receive the damage. Currently 1d4+1.

 Enhanced Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d12 + 6) piercing damage.

Tail mace. Melee Weapon Attack: +6 to hit, reach 15 ft., one target. Hit:  (1d8 + 6) bludgeoning damage. The tail mace also counts as a siege weapon.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Volcanic Lightning Breath. The dragon exhales lightning in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 13 Dexterity saving throw, taking (4d6+1) lightning damage on a failed save, or half as much damage on a successful one. On a field save the creature must make an additional Con save DC 13 or be paralyzed for 1d4 rounds, at the end of each turn the stunned creature can make another save to break free from the stunned condition.

Thunder Breath. The dragon exhales thundurus repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 13 Strength saving throw. On a failed save, the creature is pushed 15 feet away from the dragon.