you have make a pact with an ancient dragon soul

Draconic Patron

 

At 1st Level, you choose one type of dragon as your patron. The damage type associated with each dragon is used by features you gain later.

 

Dragon	Damage Type
Black / Copper	Acid
Blue / Bronze	Lightning
Gold / Red/ Brass	Fire
Green	Poison
Silver / White	Cold

Expanded Spell List

The ancient draconic lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Spell Level	Spells
1st	Command /Chaos Bolt
2nd	Warding Bond / Dragon Breath
3rd	Enemies Abound / Protection from Energy
4th	Polymorph / Compulsion
5th	Dispel Evil and Good / Geas

Dragon Lord’s Blessing

At 1st Level, As magic flows through your body, it causes physical traits of your dragon patron to emerge. 

• Parts of your skin hardens as if  covered by a thin sheen of dragon-like scales. granting you a +1 bonus to your Armor Class.
• Your hit points maximum increases by 1 and increases by 1 again whenever you gain a level in this class.
• alongside with your skin, other parts of your body like your teeths and nails hardens, transforming them in natural weapons. you can use them to make unarmed strikes. If you hit with them, you deal slashing , piercing or blunt damage equal to 1d6 + your Strength modifier, depending the weapon choosed.
• your apareance grants you proficiency with the intimidation skill
• You can speak, read, and write Draconic.

Elemental Afinity

Starting at 6th level, when you Cast a Spell that deals damage of the type associated with your Draconic Patron, you can add your Charisma modifier to that spell.

Additionally now you have resistance to the damage  type associated with your Draconic patron.

Daconic Presence

Beginning at 10th level, once per long rest, you can channel the dread presence of your dragon Patron , causing those around you to become Frightened.

As an action, you can exude an aura of fear to a distance of 30 feet. For 1 minute or until you lose your Concentration , each Hostile creature that starts its turn in this aura must succeed on a Wisdom saving throw or Frightened  until the aura ends. A creature that succeeds on this saving throw is immune to your aura for 24 hours.

Aditionally for a minute you and your allies, distance of 30 feet, cant be Frightened.

Avatar of the Dragon Lords

At level 14 you can use your action to magically assume your dragon form, in this form you use the stat block of a young dragon, of the type of your Patron. You regain this ability when you finish a long rest.

The transformation lasts for 1 hour  , or you drops to 0 Hit Points or dies. When you reverts to your normal form, you returns to the number of Hit Points you had before you transformed. If you reverts as a result of Dropping to 0 Hit Points, any excess damage carries over to your normal form.