Bloodline of IO

By the grace of IO, the everliving Dragon, formerly known as Asgorath, your transformation has allowed you to project an inner wellspring of IO's true majesty. His power is like none other, but his patience is eternal. 

Elemental Rage

At 1st level, you  can evoke IO's elemental power on your foes. Once per Short Rest, you can choose any elemental type, based on a Dragon described below. When you cast a spell using this Elemental type, you can add +1d8 to the damage of one target. This extra damage must be of the same type and effect of the Spell Cast and can only apply to one target. If your Draconic Element has two types, you must pick one and use that Element for the Duration.

This effect lasts 1 Minute. The damage element associated with each dragon type is used by features gained later. You can do this an amount of times equal to your Proficiency Bonus, but only once per Short Rest. A Long Rest resets this ability.

Totem Dragons

Dragon        Damage Type

Black           Acid

Blue             Electricity

Green          Poison

Red              Fire

White           Cold

Brass           Fire

Bronze         Electricity

Copper         Acid

Gold              Fire

Silver            Cold

Amethyst     Force or Slashing

Crystal         Radiant

Emerald       Psychic

Sapphire      Thunder or Piercing

Topaz           Necrotic

IO's Communicato

You can speak, read, and write Draconic, Celestial and Infernal. Additionally, whenever you make a Charisma check when interacting with dragons, your proficiency bonus is doubled if it applies to the check.

IO's Strength

Also at 1st level the elements start to evoke and encompasses your body, your tolerance to the Elements has increased and you have become tougher, as the Scales on your body harden. Your Hit Points Maximum increases by an amount equal to your Charisma Modifier + your Proficiency Modifier. 

Additionally, parts of your skin are covered by a thin sheen of dragon-like scales. When using your Elemental Rage Feature, you gain Resistance to the Element you chose, for the 1 minute duration. Please refer back to the Elements that you can choose when determining the Dragon and their related Elements. You can not have more than 1 Element affect you with this ability, or with your Elemental Rage Ability gained at 1st Level. To gain Resistance to another Element, you must use your Elemental Rage Feature again and choose the Dragon with the associated Element. Also, your carrying capacity is treated as once size larger than what you can carry now.

Asgorath's Affinity

Starting at 6th level, when you cast a spell that deals damage of the type associated with your Dragon you are using your Draconic Rage Ability, you can add your Charisma modifier to one damage roll of that spell.

Additionally, when you cast a spell that deals damage of the type associated with your Dragon you are using your Draconic Rage Ability with, you can spend 1 sorcery point to Evoke the Element for 1 Minute. While this Element is Evoked, anything within 10' of you takes 2d6 damage of the Element Type when they enter within 10' of you, and at the beginning of their turn if they are within this 10' area. 

Platinum Rage

Starting at 14th Level, your Elemental Rage Ability has taken on the Platinum Dragon's Destruction.

You can now pick two Elements when using your Elemental Rage Ability. Please refer back to the Dragons and their corresponding Elements. You now do +1d6 per Element Chosen, for a total of +2d6 extra Elemental Damage, for 1 minute. 

For instance, you can choose both Red and Bronze Dragons to deal an Additional +1d6 Fire Damage, and and Additional +1d6 Acid Damage each time you cast a Spell that does damage. Both of these extra damaging Elements can only be allowed to one target and cannot affect everyone in an Area of Effect Spell or Twinned Spell, unless you do both d6's to one Target of the Twinned Spell.

Additionally, you gain Resistance to both of these Elements while your Elemental Rage (Platinum Rage) is going, for the 1 minute period.

Uses are reset on the same rests Elemental Rage, and can still only be done once per Short Rest, as Elemental Rage explains. 

Tiamat's Rage

At 18th level, your Blood boils with Elemental Fury. You gain a breath Weapon while using your Elemental Rage Ability. 

As an Action you can expell your Breath weapon in a 60' Cone, or 100' Line that is 5' Wide. Your Breath Weapon damage does 6d10 + Charisma Modifier + Proficiency Modifier, of the damage type you are using on your Elemental Rage (Platinum Rage Ability). You can still use the two choices from your Platinum Rage Ability, and can Breath each once per Short Rest, but can only be used once per round each.

In addition, you have a Special Reset Breath that can reset your Breath Weapons on a 5 or 6, when rolling on a d6. If you reset your Breath, you can use your Breath again, even if you have already used your Breath Weapon Attack this Short Rest. You can only Reset your Breath Weapons once per Long Rest.

You can use this special Breath reset for reset both your Breath Weapons, or just one if you so choose.