Foss is a broad-shouldered human man with weathered bronze skin, iron-gray hair cropped close at the sides, and a black beard streaked with silver. His pale green eyes sometimes flash with ember-red light when his patron's power stirs. He wears battered leather armor beneath a dark traveling cloak, carries a hooked walking staff, and keeps a small black iron charm hidden beneath his shirt. Old scars cross his hands and throat, reminders of the years he spent serving darkness before turning against it.

Foss is patient, observant, and unexpectedly gentle with frightened people, animals, and anyone who has been abandoned. He speaks plainly, dislikes ceremony, and has a dry sense of humor that emerges at the worst possible moments. Though he carries himself like a grim wanderer, he is quietly hopeful and goes out of his way to leave places safer than he found them.

Foss was born far from any city, among a human caravan that crossed old roads, mountain passes, and trackless forests. He learned to read weather in the shape of clouds, recognize distant danger by the silence of birds, and judge a stranger's character by the way they treated the weak. As a young man, he entered a ruined shrine seeking the power to protect his people from raiders and corrupt lords. Something ancient answered. The bargain gave him command over flame, shadow, and hungry unseen forces, but it slowly taught him to see justice as punishment rather than restoration. For years, Foss walked the path of darkness, hunting tyrants, predators, and those who profited from suffering. His victories were effective, but often cruel. His turning point came when he spared a frightened child who had been raised by one of his enemies. In that moment, Foss understood that justice without mercy merely creates another generation of monsters. He broke the spirit of his pact, though not its power, and now uses the darkness within him as a weapon against darker things. He travels as an outlander, appearing wherever the law has failed, guided by a personal code that protects the innocent while leaving the guilty terrified. Some call him a champion. Others call him an executioner who has learned better words.