Kallista is a 5'10 tiefling of solid, powerful build. Her most striking features are her massive, curved horns resembling those of a mountain goat, which she often polishes with oils. Her skin has the hue of weather-beaten granite, and her blueish-gray eyes are deep-set. Her thick brown hair appears mundane at first, but under the light of a forge or midday sun, it reveals streaks of shimmering, natural gold. She wears practical clothing of heavy indigo wool and forest green linen, reinforced at the seams for durability.

Kallista is as steady as the bedrock of her mountain home. She is a woman of few words, preferring to let the weight of her hammer and the quality of her craftsmanship speak for her. She is incredibly pragmatic and views the world through the lens of a builder, she sees things in terms of their structural integrity and long-term utility. Despite her stern exterior, she has a quiet reverence for life and a surprising gentleness when handling delicate plants or small animals.

Kallista was born in the craggy peaks of the Cloudpeak Mountains, raised within a guild of miners and metalsmiths. While her infernal heritage was initially a cause for concern, her unusual physical traits, specifically the gold in her hair and her mountain goat horns, were eventually interpreted as an omen of prosperity by the Guild of Ironsmiths. She spent her youth at the forge, learning to respect the balance between the gifts of the earth and the heat of the fire. She didn't seek the life of a holy warrior, it sought her. During a season of terrible landslides, she witnessed a valley of ancient trees being swallowed by a greed-fueled mining expansion. The loss of that balance struck her more deeply than any sermon ever could. She took up her smithing hammer and swore the Oath of the Ancients, pledging to be the shield that protects the light of the natural world from the darkness of mindless consumption. She believes that a piece of metal is like a soul, it must be tempered to be strong, but never allowed to become brittle. She travels now to ensure that the beauty of the world is preserved for future generations of makers, using her martial skills to hammer down those who would exploit the land beyond its limits.