Poison Blade

The Poison Blade is a Hidden Blade upgrade, essentially a hollow needle equipped with poison. Whoever you inject with the poison will go berserk, swinging their weapon wildly and attacking all those in range, but not killing them unless they're already low on health or are hit multiple consecutive times. Ezio can recharge this weapon by buying poison from roadside doctors.

Poison vials cost 250 florins each and you can carry up to five vials, but poison pouch upgrades bought from the Tailor raise the amount of vials you can carry at once.