The Eye of the Sun, a Force-imbued artifact, originated from a collective of Jedi Masters. They forged it to serve as a bulwark against the Brotherhood of Darkness during the Ruusan campaign. Subsequently, it was concealed beneath the Heart Tree – specifically, the ch'hala – located on Cularin. In 19 BBY, the Dark Jedi known as Len Markus sought it out at this location, his intention being to empower the Darkstaff through contact with the Eye, granting it the capacity to obliterate Cularin.
Its appearance was similar to that of a stone, yet it possessed the ability to emit a silver glow and manifest a sizable yellow eye on its exterior, should it choose to do so.