The Dragon Slayer Longsword is a magical weapon that Vox Machina retrieved from the lair of the white dragon Rimefang. It is generally wielded by Percy for the rare occasions that he needs to make a melee attack, but he often lends the sword to other party members (usually Vax'ildan) when he feels that they could make better use of it than him, such as during the battles against Umbrasyl and Thordak.
Dragon Slayer Longsword
Wonderous Item, Rare (requires attunement)
Slot: 1-handed Weapon - Value: 4,800g
You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you hit a dragon with this weapon, the dragon takes an extra 3d6 damage of the weapon's type. For the purpose of this weapon, "dragon" refers to any creature with the dragon type, including dragon turtles and wyverns.