Along with other Weapons in Assassin's Creed Syndicate, Cane-Sword is one of its kind introduced in the Syndicate. There are various kinds of Cane-Swords in the game which can be unlocked. Here are the Cane Sword Types and Upgrade: Assassin's Creed Syndicate.
Cane-Sword are mostly used to stun enemies and is far lethal than other weapons like Kukri, Brass Knuckles etc. These can be bought by purchasing and some as rewards from the mission whereas unique Cane-Swords can be obtained by reaching a certain Loyalty Level.
Sir Lemay’s Cane
Initiate’s Cane-sword - 500£ to upgrade
Noble Cane-sword - 2500£ to buy
Charles Dickens’ Cane-sword - Complete Charles Dickens memories
Golden Lion Cane-sword - Story progression required
Runic Mayan Cane-sword - Level 2 required and 4500£ to upgrade
Ivory and Jade Cane-sword - Level 8 required and Needs to be crafted
Light and Dark Cane-sword - Level 8 required and Reach Loyalty level 3 with Robert Topping
Arbaaz Mir’s Cane-sword - Exclusive Uplay Reward