When Shiro and Keith came to meet Kolivan revealed that Keith was brought the knife which had the symbol of the Blade of Marmora. When he was put in to try to wake his knife it was initially difficult. But Keith managed to raise its, and it was possible only if the blood of Galra flowing in his veins. And after that the Blade of Marmora began to help Team Voltron to put down Zarkon. When Antok, Kolivan and Allura fought against the Haggar and Druids Antok died fighting against them.
Abilities and Traits
Antok was a large being, taller and bulkier than most of his fellow Blades and possessing great strength while remaining quite agile. He is the only named Blade thus far whose face has not been seen, as he kept his face mask up constantly. For some reason he possessed a tail; whether this means he was a non-Galra or some other explanation exists is unknown.