Tarn was born in fire and silence. A catastrophic wild magic surge, emanating from the mountain near Thundertree, leveled the settlement and tore a rift between the Material Plane and the Shadowfell. The destruction sorcerer who cast it lost everything: his home, his confidence, and an animated rock companion he had named Rocky and Rocky's little rock family. The sorcerer never knew he had also fathered a child, long ago, in a desperate moment after being cast out of his tribe.
The raw elemental earth energy reshaped the unborn child in the womb. His mother did not survive the birth. He was born not as his father's race, nor his mother's, but as something the surge had forged: Earth Genasi. Stone-skinned. Grounded. Elemental.
Stumbling his way to Duskmire's Edge alone, a Shadowfell-adjacent slum that had grown around the wound like scar tissue, he grew up nameless among the Rift Rats, orphaned children who lived in the shadow of the rift. The Rats held a grim superstition: to name someone was to mark them for the Raven Queen. So none were named, and none were mourned.
There, he crossed paths with another nameless youngling: a Tiefling who spoke to shadows and made ravens circle nervously overhead. They ran together for a time. Neither named the other, both shaped by extradimensional forces far larger than themselves, both drawn together by a dark resonance neither could explain.
Then the Tiefling suddenly vanished, presumably called away by one of his whispers that the stone-skinned genasi could never hear, nor would he follow. He was alone and wandering again.
He found his way through the foothills to a small monastic order in the Sword Mountains. They called themselves Disciples of Grumbar, followers of the elemental lord of earth, and they kept a hermitage carved into the high cliffs east of Thundertree: the Hermitage of Still Earth. They saw the tremors in the ground when the boy was afraid. They saw his stillness when he finally surrendered to exhaustion. They believed him to be a child of Grumbar himself, sent from the deep earth. They named him Tarn ("still water held in stone") and taught him to channel what was inside him rather than suppress it.
He carries an innate awareness of his magical lineage. No father, no face to attach to the force that brought him into this world, but a feeling in his blood and in his skin, a knowledge that the chaos within him was bestowed by a powerful being. He is not searching. He has found peace. But the knowledge sits in the back of his mind, in the depths of his soul, waiting.
When Tarn manifests his astral self, it appears as arms and visage of cracked, ancient stone, split by fracture lines that glow with warm amber light from within, like magma visible through cooled volcanic rock. The destructive earth magic of his unknown father, harnessed by decades of practice in monastic discipline.