God of Rot and Decay. Native to Hoshek, Plane of Life.

Its bones are carved with runes that glow cobalt blue. Something about the skeleton transfixes you. - Gate of Brizoor Waal (RPA-ADVF)

Eventually all things crumble and return to dust, and this decay is the realm of Lord Troshag, who has come to observe Azema’s labors. This new plane she is building is rich with every form of life, and so it will need every form of death and decomposition. Ulos is not yet done, and already its lands fill with the bodies of fallen warriors. This plane will be a bountiful place for Troshag. No matter who wins these conflicts, all will one day enter his domain. - Dawn of Ulos (DoU)

When traveling to Hoshek, Plane of Life, the Rune Bones are called to a Troshag;

In the midst of all this life, you spot a dead zone. A ring of wilt and rot, encircling a humanoid skeleton resting on a large stone plinth. Its bones are carved with runes that glow cobalt blue. Something about the skeleton transfixes you. - Gate of Brizoor Waal (RPA-ADVF)