Selezthin

Sele'Zthin is a human wizard from the plane Ceil'Welden who came to Ysenn to study its plane core. He arrived in Ynnfelin, where the head of the academy Grand Zeph Sarquinal offered to guide him to the core's location. Traveling across the plane, they arrived in the Mines of Syglykh, where they encountered a group of solidars who wanted them to leave the core undisturbed. Explaining that he only wanted to conduct basic experiments on the core to help his research into the fundamental nature of magic, they proceeded but discovered that the core was missing, followed by Sarquinal revealing that he was Krurymtir, Eidolon of What Can Be Coveted in disguise and nearly killed them before Selezthin managed to teleport himself and the solidars to Bhiafynd.
Still wanting to research the core, he joined the solidars as they traveled around Ysenn preparing to face Krurymtir until he was abducted by Meldryn and Yldrei during the battle of the lone herd in the Jholm borderlands.
He is cowardly, not trained in combat magic, and selfish. Compared to his sheltered scholarly lifestyle, he is not experienced in survival and traversing the wild, causing him to struggle and constantly complain while manuvering Ysenn.