Which Assassin's Creed game introduced the grappling hook for climbing London buildings?

Assassin's Creed Syndicate introduced the grappling hook for climbing London buildings. The tool is used by the Frye twins, Jacob and Evie, to reach rooftops quickly and cross gaps between structures in Victorian London.

The grappling hook is one of Syndicate's signature gameplay additions. It allows the player to attach to suitable surfaces, pull upward, or create a zip line between buildings. This makes traversal faster than relying only on traditional climbing.

Syndicate takes place in London in 1868, during the Industrial Revolution. Its setting includes crowded streets, factories, bridges, and tall buildings that make the device especially useful. The hook is sometimes confused with the rope launcher in Assassin's Creed Revelations, but that earlier device served a different function and did not provide the same grappling-hook traversal system.