Dauntless

The Slayer's Path is a skill tree of sorts that allows you to unlock various activities in the game (such as the Hunting Grounds islands, ability to Reforge, etc), as well as passive buffs for your slayer (such as elemental resistance, better tonics, etc). You will progress along the main path based on how much experience you earn from hunts and bounties. If you completed the achievement in the base game for getting to Mastery Level 40 ("Slayer Supreme") you will easily have enough experience for this. If not, you'll get this along the way to working toward that achievement. The only thing you need are the main 12 nodes moving upward on the skill tree, all the lines off to the sides are optional.