Andrzej Sapkowski's series Edit
Esterhazy, a very noted swords salesman in the town of Fano, gave it to Ciri as a gift, when she has been captured by Leo Bonhart. The sword was made with dark iron and the shape of the blade resembled a flame, as is common in the gnomic tradition. On the blade, were engraved many floral decorations and a tower with a swallow on the top. The name Zireal, derived indeed by the Elder Speech that means Swallow.
Zireael is a unique silver sword that can be seen in one of the endings to The Witcher 3: Wild Hunt.
The sword is given to Geralt by Master Ort at the now-abandoned Nilfgaardian Garrison at White Orchard. It can only be obtained if the so-called "good" ending of the game is achieved. The sword does no damage in combat as it is intended to be given to Ciri, as a fitting way to start her witcher career.
The weapon's craftsman, Master Ort, remarks that "no witcher has, or ever had, a better weapon", when he presents it to Geralt. Zireael has a 38½ inch blade, a silver-plated siderite steel core, and glyphs and runes throughout the length of the blade, and on the hilt.
The sword may have one of two possible inscriptions in Elder Runes, depending on the dialogue option that is chosen. "Zireael", meaning "Swallow" in Common Speech, is one possibility. The other is "Dubhenn haern am glâdeal, morc'h am fhean aiesin" which translates to "the flash that cuts through darkness, the light that breaks the night".