Blessing of Tiamat

You only get enchanted by this spell if someone who Tiamat gives permission to cast this spell casts this spell, or if the DM decides that Tiamat casts this spell on you.

You bless one creature. If that creature is a Chromatic Dragonborn, then apply the following:

Choose one

The person gains immunity instead of resistance to the element of their breath weapon.

The person may choose whether to use their breath weapon in a 15 ft. cone or a 30 ft. line each time they uses their breath weapon, increasing the length by 5 ft. every 5 levels.

The person may choose what saving throw the target/s of their breath weapon has to do each time they use their breath weapon, making the saving throw DC harder by 1 every 5 levels. 

The person may choose to have the ability to become a Chromatic dragon of their element every long rest, changing the type of dragon every 5 levels, from a wyrmling to an ancient dragon.

Additionally, the person may change the colour of their scales and the colour of their breath weapon to any Chromatic colour, but they may not change the element of their breath weapon or the element that they are resistant/immune to.

If the creature is not a Chromatic Dragonborn, then apply the following:

Choose one

The person may choose to have their skin replaced by scales and have resistance to a Chromatic Dragonborn element of their choice. They may change the colour of their scales to any Chromatic colour, but not the element they are resistant to.

The person gains a breath weapon of a Chromatic Dragonborn element of their choice. They may change the colour of their breath weapon to any Chromatic colour, but they may not change the element of their breath weapon.

This spell can only be dispelled by a 9th level Dispel Magic.