This feat may apply to any class and any race: if a player slays 1 Giant, 3 Trolls, 5 Ogres, and 1 Werebear, they gain this feat. They can only kill the monsters with a longbow, longsword, or a great sword.
When a player gains the Troll Slayer feat, they have +7 on all hit rolls and damage rolls made against creatures Large or bigger. They will also have a +5 on acrobatics and athletics.