Oberin, e.g. they too were seeking to purchase magic stones for some private testing at the time of Seth's illness. Nonetheless, Tesdor accepted to accompany Evers to the Central Island to supervise one of her experiments with the stones in the Waking Moon of 431. He did not seem to be proficient in Black Magic, by then, beyond some rudimentary spells.
Tesdor went missing at the same time as Vaup, yet returned earlier telling the Vanguardians that he together with Vaup had been trying to destroy a camp of the Alliance and that Vaup had been lost while getting in possession of a powerful artefact, which has been found to be a gem of the Royal Sceptre.