Tiamat

Tiamat has bestowed upon you great power in exchange for eternal servitude. Rise and take up the mantle of your Goddess. Ever listening and obeying for Mother knows best. 

Expanded spell list

Mother wants her little champion to succeed in all her endeavors so she bequeaths you even more magical prowess. Exercise mothers arcane power over those in her way.

Mothers resistance

Starting at 1st level, as a bonus action you chose one form of elemental resistance. This resistance lasts until your next short rest. At the end of every short or long rest you must either pick a different element or re-up your current resistance.

5 heads are better than one

Starting at 6th level, you have a pool of 5d4 yo can use them to alter any action or damage role. these are replenished after a short or long rest.

Mothers breath

Starting at 10th level, you gain a dragon(born) breath weapon. The element of your weapon is chosen after a short or long rest. Usable once every short rest.

Mothers little darling

Starting at 14th level, once every long rest as an action you sprout 5 different chromatic dragon heads. All of which simultaneously use a breath weapon equivalent to an adult dragon (18d6 of their associated element). During this you also do a breath weapon doing 9d6 psychic damage.

Bit too much

Using any spell slot (along with the spell happening) forces you to roll on the wild magic table. No random chance to to so, you just do.

Mothers skin

You have an unarmored AC equal to 13 plus your Charisma modifier.