Grandmaster's Path is the Maister tome for the Warfarer vocation. Reading it teaches Rearmament, which switches instantly to another weapon the user carries.
Lamond gives it after The Sotted Sage, once he has his Newt Liqueur and has unlocked the Warfarer vocation.
A tome detailing an exceptional ability for warfarers. Use it to learn Rearmament.
Speak to Lamond on Agamen Volcanic Island to start The Sotted Sage.
Bring him three Newt Liqueur to unlock the Warfarer vocation.
Talk to him again to receive the tome.
Lamond, the Warfarer Maister at Geyser Hamlet, grants it as a mark of approval once the Sotted Sage side quest is done. Three Newt Liqueur handed to him unlock the Warfarer vocation, and talking to him once more afterwards brings the tome.
Grandmaster's Path Map Location and Quest Guide
The Sotted Sage is a side quest given by Lamond on Agamen Volcanic Island. Lamond starts the conversation himself and asks for Newt Liqueur. Speaking to Lamond after the Warfarer vocation unlocks earns Grandmaster's Path.
Speak to Lamond on Agamen Volcanic Island to take the quest.
Collect three Newt Liqueur. One sits on the table in Gautstafr's home during Put a Spring in Thy Step.
Buy more at the tavern stand of Higgs in Bakbattahl. Carry one of the sacks outside into the fenced area to be let in, and wear a Beastren Mask unless the Arisen is beastren.
Hand the Newt Liqueur to Lamond. He gives a Rotten Soft-Boiled Egg along the way.
Deliver the third Newt Liqueur to unlock the Warfarer vocation.
Talk to Lamond again to receive Grandmaster's Path, which teaches Rearmament.