In February 1266, Vilfrid was tasked with overseeing an operation which was to prove whether Yarpen Zigrin's company was collaborating with the Scoia'tael. He was appointed a commander, responsible for the convoy with gold and silver being allegedly a financial help for King Demavend III. In fact – unknown to the dwarves who served as his guards – the real cargo was not treasure, but mere stones.
He died as a result of wounds from Scoia'tael arrows when the convoy was ambushed near Shaerrawedd. When they were rescued by the Dun Banner, the dying Vilfrid told Sir Fredegard that they were mistaken and Yarpen was innocent.