Costume concept design
... "Surmatarja women or "witches" are beautifully built, with attractive looks, beautiful singing voices, and incredible grace. Depending on the tribe, surmatarja possess a different set of anthropological characteristics, but in most cases witches are taller than the average human, have high reaction speed, see in the dark, hear perfectly, and distinguish odor subtly, even at the level of emotion."
Excerpt from the Encyclopedia of the World of Assaria