Kaelith is a haunting figure whose skin has transformed into a layered, peeling texture identical to gray birch bark. Their fingers are elongated and end in blunt, wooden tips that leave scratch marks on any surface they touch. While their body is ravaged by the forest corruption, their eyes remain a piercing, luminous violet that seems to track movements even in complete darkness. Their movement is jerky and insect-like, yet they can become perfectly still, blending into the wooden walls of the Hollow. Surprisingly, they possess a soft, melodious singing voice that is entirely at odds with their ragged, skeletal frame.

Kaelith is a creature of fractured loyalties, possessing an intense devotion to the Heartseed while simultaneously harboring a paralyzing terror of those who seek to use it. They are pathologically honest about the dangers of the forest but will lie about their own identity to avoid being dragged back to the Altar. In moments of relative calm, they display a scholarly curiosity, but the slightest loud noise triggers a regression into a state of whispering madness where they can only speak of 'The Thrum.'

A decade ago, Kaelith was a renowned dendrologist who sought the Heartseed for its medicinal properties. They were lured into the Cult of the Sanguine Root by promises of divine ecological balance. The turning point occurred during the 'Rite of the Red Sap,' where Kaelith witnessed the ritualistic drainage of an innocent to feed the tree. They fled into the deeper layers of Rotskogen, and the forest, sensing their broken spirit, began to reclaim their physical form. Now, Kaelith exists in the liminal space between a living person and a part of the dungeon floor, surviving on moisture collected from the walls.