As a member of the Hunting Blades, Tison shares a deep hatred for all monsters. He is shown alongside Clint and Nan in Caer Bocram, where he fights against the Dragon Rider. In the process, the blastia is destroyed, and a monster is released, causing Yuri Lowell and his companions to fall below. Tison later appears in Nordopolica while the Hunting Blades are seeking to exterminate the monster holding the Duce captive, only to discover that the Duce was the "monster". He often resorts to force on the reasoning that anyone helping monsters "doesn't deserve to be considered a person", such as when he and Nan fought against Judith and the rest of the party in an attempt to kill Ba'ul.