race features:
Skills
You gain proficiency in one skill of your choice.
Subrace
You gain the abilities of your chosen subrace.
Humans are plentiful and vast. They walked with the Three the least, instead seeking to form relationships between themselves and the rest of the Originals. When the Split happened, they asked for the gift of adaptation so they could continually overcome the difficulties of their chosen environment. Humans naturally want to explore, expand, and conquer. Their lifespans are shorter than any other Original, but they make the most of their lifetimes.
Humans are as expansive as they are unique. Even from society-to-society humans can be incredibly unique. However, they mostly exhibit the want to be together and form dense packs. Humans unite under a banner, something that gives them a sense of oneness and pride. They banner can vary slightly from tribe-to-tribe, but every subrace has a main banner that the variant is contrived.
Children of human subraces are an outlier. They do not share or meld traits between the subraces like many other races do. When a child is born they have a 50% of being either the mother's of the father's subrace. This is only true if both parents are humans. Humans are able to breed with elves, tieflings, other humans, and orcs. When humans breed with anything other than a human, they lose the uniqueness of their subrace, melding with the traits of the other race instead.