of them was sprung , upon the side of his fathers , bright earendil ; and in the lay of earendil it is told how at the last , when the victory of morgoth was almost complete , he built his ship vingilot , that men called rothinzil , and voyaged upon the unsailed seas , seeking ever for valinor ; for he desired to speak before the powers on behalf of the two kindreds , that the valar might have pity on them and send them help in their uttermost need .