Humans

Nearly half of Sanctum Hollow is made up of humans. They are short-lived but adaptable and generally ambitious. They seem to show the most flexibility with which types of essence they have an affinity for. 
Curiously, humans seem to have a malleable form as well as spirit. When they come of age to express their affinity for a certain type of Weaving and aura, they start to take on elements of those aspects as part of their physical form. For example, a human Sizer with an affinity for earth aura may begin to resemble a goliath, earth genasi, dwarf, or half-Orc, particularly when spinning essence through their Soulthread.