Cosmic Heritage

From the beginning of the universe to the end of time the cosmos itself lives within your bloodline. You descend from an ancient and mighty cosmic being, be they a god or not, one thing that is undeniable is the power you have been granted. Unfortunately, all this power comes with a curse, your body must be able to contain an immense amount of power, due to that, your spellcasting ability is your constitution.

Cosmic Ancestry

As the blood of the cosmos runs within your body, you gain access to innate knowledge of the upper planes, allowing you to interact with any celestial unhindered. You can speak and write celestial, and have advantage in any charisma based check against a celestial.

Cosmic Absorption

As magic flows through your body, it causes your body to become unnaturally resilient, that effect is extended to any set of light armor you wear, though, to a lesser extent.

When you aren’t wearing armor, your AC equals 13 + your Dexterity modifier, while wearing light armor, your AC is increased by 2 + your Dexterity modifier.

Elemental Absorption

Starting at 6th level, whenever you take a long rest, you may choose an elemental damage type. For the next hour, you will have resistance against the chosen damage type.

Student of the Cosmos

At 14th level, you gain an additional benefit based on your current phase in the cosmic cycle. Every dawn, you must roll a d4 to define which phase you are currently in. 

Phase of the Sun : You gain a +2 bonus to Initiative checks and Attack rolls.

Phase of the Moon: You gain a +2 bonus to Deception checks and Stealth checks.

Phase of the Stars: You gain a +2 bonus to Insight checks and Perception checks.

Phase of the Planets: You gain a +2 bonus to Survival checks and Animal Handling checks.

Stellar Ray

Beginning at 18th level, you can channel the full might of the cosmos to engulf the surrounding area with radiant magic, causing any creature, including allies, to make a Constitution save., on a failed save, they receive 10d12 radiant damage, taking only half as much on a successful save.