|This article contains canon information corresponding to the Tales of Arcadia franchise. That means all information in this article is true and has appeared/been validated officially on-screen.|
Many years, the human and troll worlds lived in separate worlds peacefully. However, a dark witch named Morgana orchestrated and sowed seeds of dissension between both worlds. Humans and trolls fought for control of the surface worlds, blood was shed, and the first Heartstone rotted and corrupted from within. From the corrupted Heartstone, Gunmar was born.
The fragment of Gunmar's Heartstone, the Birthstone, was kept within Gatto's Keep in Ojos del Salado.
In "The Shattered King", Jim, with some help from Vendel, cleaves the Birthstone from its shell and places it within his amulet. With the Birthstone, it unlocks the Trollhunter's ability to summon two boomerang-like daggers called glaives.