Elves possessed great magical powers, and the ability to create things of immense beauty, craft and enchantment, including weaponry, music, language, and lore. The Daggers of Legolas reflect that beauty, and were the perfect weapon for the "Assassin" Legolas. His skill with these daggers combined with his excellent marksmanship with the bow proved to be the death blow for many orcs and Uruk-Hai!