In Assassin's Creed Revelations, Ezio Auditore uses a weapon called the hookblade.
The hookblade is an extension of the traditional hidden blade, adding a curved hook that helps Ezio climb, swing, catch ledges, and move across Constantinople. It also supports combat techniques and allows him to travel along the city's network of zip lines. The device is introduced as a distinctive tool of the game's setting rather than as a simple replacement for the hidden blade.
Revelations takes place mainly in Constantinople, where Ottoman architecture and dense urban districts make vertical movement especially important. Ezio learns techniques associated with the hookblade from Yusuf Tazim, leader of the local Assassin organization. The tool's mobility functions are therefore closely connected to the game's environment and local Brotherhood.
The hookblade is sometimes confused with a separate rope launcher or with the hidden blade itself. It is better understood as a hooked Assassin bracer that complements the hidden blade. Its design is one of the major gameplay additions introduced in Revelations.