Dragon's Dogma 2

To unlock this vocation you need to make it to the Volcanic Island camp and locate a man named Lamond, he's next to the hot springs.

His quest requires you to give him 3 Fruit Wines which are quite rare.

There is 1 located in Bakbattahl, near The Wanderer's Haven, there will be a small quest involving a duel.

A second can be given by Captain Brant after buying the house in Vernworth and completing his main quests (it will be outside your home afterwards).

The other option is to duplicate it at the Scrap Store at checkpoint rest town. So you actually only need to find one fruit wine. The one in Bakbattahl is easiest to acquire

If for whatever reason you don't get this on your normal playthrough you can get this in the Unmoored World during the quest The Importance of Aiding Ernesto located in the Volcanic Island camp.

You'll eventually be required to speak to Lamond, finish his dialogue and you'll automatically unlock the Warfarer vocation.