Ezio went on to notably use it during the assassination of Marco Barbarigo in Venice, masking the sound of the device with the fireworks of Carnevale, an annual festival that the Italian city held. After Leonardo da Vinci translated the page with the Hidden Gun's design, he created the weapon for use by Ezio Auditore. Īltaïr later recorded his designs in his personal journal, which eventually came to be known as the Codex. There, he spoke briefly to Abbas Sofian of the things he had learned from the Apple, 'Of life and death, of the past and the future.' After stating that he would show him, Altaïr shot Abbas with the Hidden Gun, resulting in the latter's death. The first known time that Altaïr made use of the Hidden Gun was in Masyaf, after his return from exile. However, ammunition for the Hidden Gun was scarce, so he went on to refine a combustible powder that could be manufactured from common ingredients. In the early 13th century, during his experimentation with the Apple of Eden, the Assassin Mentor Altaïr Ibn-La'Ahad was able to miniaturize the design of a standard firearm into a 'fiery weapon' small enough to be concealed on the wrist. It is capable of grievous damage – even from great distance.' ―Altaïr's Codex, page 28. 'We have found a way to alter the structure of the hidden blade so that it can be used to launch small projectiles.