Scribbled down some notes and chopped up some existing races...
Demigods
by argentmantleAbility Score
You may choose two ability scores to raise by 1.Immortal Blood
You have remarkable fortitude, represented by the following benefits.
You have advantage on saving throws against being poisoned.
You are immune to disease.
You are immune to aging.Darkvision
Thanks to your immortal creation, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.Immortal Lineage
When you create your character, choose a Sphere of Immortality that your parent belonged to. These spheres are Energy, Entropy, Matter, Thought, and Time. You gain certain additional abilities based on this selection. Once selected, this cannot be changed.Spell-like Abilities
The children of an Immortal parent have some remarkable abilities based on the Sphere of their parent.
Energy
You know the produce flame cantrip. Once you reach 3rd level, you can cast the burning hands spell once with this trait as a 1st-level spell, and you regain the ability to cast it this way when you finish a long rest. Constitution is your spellcasting ability for these spells.
Entropy
You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the hellish rebuke spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long Charisma is your spellcasting ability for these spells.
Matter
You know the mending cantrip.
When you aren’t wearing armor, your AC is 12 + your Constitution modifier. You can use your natural armor to determine your AC if the armor you wear would leave you with a lower AC. A shield’s benefits apply as normal while you use your natural armor. If you choose to wear armor, you gain a +1 bonus to your AC.
Thought
You know the guidance cantrip. When you reach 3rd level, you can cast the comprehend language spell once with this trait, and you regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the detect thoughts spell once with this trait, and you regain the ability to do so when you finish a long rest.
Time
You know the true strike cantrip. When you reach 3rd level, you can cast the expeditious retreat spell once with this trait, and you regain the ability to do so when you finish a long rest.Resistance
Each sphere of immortality has a resistance associated with that is gained at first level. This is determined by their Immortal Lineage.
Energy
You gain resistance to your choice of cold, fire, or lightning damage. You may select a different energy type whenever you gain a level.
Entropy
You gain resistance to necrotic damage.
Matter
You gain resistance acid or poison damage. You may select a different energy type whenever you gain a level.
Thought
You gain resistance to psychic damage.
Time
You don’t need to sleep and don’t suffer the effects of exhaustion due to lack of rest, and magic can’t put you to sleep. When you take a long rest, you must spend at least six hours gathering your thoughts and preparing yourself.