A Fishing Tome is a rare experience reward from the miniquest, Temple Trekking. You can get one by taking one of the followers To Paterdomus or to Burgh de Rott. At the end, you will get a Reward token and then speak to the banker in Burgh de Rott bank or Hiylik Myna by the Paterdomus. The Fishing tome grants fishing experience once read. A higher level reward token will give more fishing experience, with a tome from a level 3 token giving up to 4000 experience.