Mark of the Ascendant

As you have grown, your mark has grown with you.

Increase your Constitution score by 1 and one Ability Score of your choice, to a maximum of 20.

• You learn a cantrip of your choice from the sorcerer spell list. In addition, choose a 1st- 7th level spell from the sorcerer spell list. You learn that spell and can cast it through your mark. Once you cast it, you must finish a short or long rest before you can cast it again through the mark. Constitution is your spellcasting ability for these spells.
• When you cast the 1st-level spell through your mark, you can expend one of your Hit Dice and roll it. If you roll an even number, you gain a number of temporary hit points equal to the number rolled. If you roll an odd number, one random creature within 30 feet of you (not including you) takes force damage equal to the number rolled. If no other creatures are in range, you take the damage.
• Your essence is written separate from the flow of causality. You stop aging and gain the ability to create your own Ascendant realm and the ability to transform into your True form. You gain the ability to cast  a special version of Demiplane that will take you to your Ascendant Realm at will. In  your Ascendant Realm you have advantage on all attacks, skill checks, and saving throws. In addition you can move in and out of your True form at will. 
• While outside your Ascendant Realm you can use a special version of Shapechange on yourself once per day to transform into your True form.
• When killed outside your Ascendant Realm your essence returns there and you regain a physical body over 1d100+10 days.
• The only way for you to truly be killed is by: Being killed while in an Anti-magic effect, Being killed by a being of a higher Divine Rank, or being killed in your Ascendant Realm.
• Work with your DM to craft a signature ability. A trait, action, or custom spell unique to you that will be used once per day when in your True form and outside your Ascendant realm.

You also choose a Flaw from the following table, or roll a d8 and take that Flaw. Or work with the DM to come up with a different Flaw.