A human transmuter of 9th level who was the most well-known and accomplished wizard in The Vale. He was of an evil and self-serving nature and had a shadow demon servant in his Tower Indestructible in New Haven.
He arrived here from the plane of Tyrellia in a teleportation fumble along with his archenemy, Aranor Skarsnik and his giant eagle steed. Aranor tried to stop Logos from taking over his lord’s kingdom of Rho Tyrell and when Logos tried to escape by casting a spell he had no experience with, it backfired and they both ended up on Crucibal.
He made a secret deal with the Phyrexians on the other side the Sentinel’s Gate who was unaware that the magical wards which kept them out was down. Logos told them to send in their scouts to check The Vale out in exchange for a high position and access to their Forbidden Archive in their city of Primus-One.
The Heroes of Crucibal discovered this treason and informed Gurion Goratell about it. In an epic battle of spellcraft, they destroyed each other simultaneously, the Tower Indestructible was toppled and his shadow demon servant was slain.
Since that moment, an iron placard and chain was placed on the ruins of Logos’ tower saying: “This was the Tower Indestructible of Logos Sarx the Wizard. He betrayed the people of The Vale. Take a moment to ruminate over these ruins. Any questions?”