Aasimar

Biology
Aasimars are humans with a significant amount of celestial or other good outsider blood in their ancestry. While not always benevolent, Aasimars are more inclined toward acts of kindness rather than evil, and they gravitate toward faiths or organizations associated with celestials.

Aasimars look mostly human except for some minor physical trait that reveals their unusual heritage. Typical aasimar features include hair that shines like metal, jewel-toned eyes, and lustrous skin color

Creation
Astranian Aasimar were created in an attempt to create the perfect race by combining the DNA of humans, celestials, and the best of previous generations of races.

Aasimar Traits
The base Aasimar Traits can be found on the D&D 5th Edition Wikia.

Absolute Aasimar
Ability Score Increase: Your Intelligence score increases by 1.

Holy Presence: Starting at 3rd level, you can use your action to unleash the divine energy within yourself, causing a halo formed of pure light to materialize above your head.

Your transformation lasts for 1 minute or until you end it as a bonus action. During it, you bestow hope and vitality upon your allies and gain the effect of Beacon of Hope with a range of 30 ft. Choose any number of creatures in range. While the spell persists, they have advantage on Wisdom and death saves, and regain the maximum possible hit points from any healing. You do not need to maintain concentration. As a reaction, you can designate an ally within sight to do extra radiant damage when they deal damage with an attack or a spell. The radiant damage equals your level.

Once you use this trait, you can't use it again until you finish a long rest.