In Assassin’s Creed 2 for the PS3, Xbox 360, and PC, you can unlock the Condottiero War Hammer by collecting feathers. The Condottiero War Hammer is actually one of the better weapons in the game, so if you can get it early you’ll have a huge advantage.
To unlock the Condottiero War Hammer, you’ll need to collect 50 feathers throughout the game. Once you do, put them all into the box in your villa and talk to your mother, then the cape will be unlocked.