Dauntless

As you earn experience from killing monsters and completing bounties, you will level up your proficiency with each weapon type (separately, depending on what was equipped when you killed the monster or turned in the bounty). Once you hit Level 20 with a weapon, you can choose to reforge it at the pylon inside Ramsgate near Katerin Sorrel. Doing this will reset the weapon's proficiency to Level 1, but add a passive buff to your slayer whenever you wield that weapon type. Reforging the same weapon multiple times will make you increasingly more powerful that other slayers who don't. Bear in mind, you won't be able to take that weapon on high-level hunts until you level it back up. Reforge any weapon once to unlock this achievement.
 
Note: You need to complete the achievement Veteran Slayer (80G) before this function is available to you.