Dragon slayers are a class specialized in battling dragons. They are equipped with skills which are all very useful against dragonkind. They are led by Galanoth, who can be found in Dragesvard.
To Become a Dragon Slayer
If you desire to be a dragon slayer, simply travel to Dragesvard. Upon arriving, you will immediately see Galanoth on a corner. Talk to him about being a Dragon slayer, and take up a quest which rewards you with an ice dragon scale, the item that gives you the right to be a dragon slayer.