The flame wheel is a weapon in all of the three classic games of Ninja Gaiden. It's basically like an invincibility star: it surrounds Ryu with flames, lasts about 5 seconds, costs 20 PP to use and kills every enemy (except bosses) in one hit. The diamond shield (i'm not sure about the name) is a weapon present only in Ninja Gaiden 3. It shoots two projectiles in form of diamonds at the same time. One of them goes upwards, the other downwards, than they invert their direction (the upwards one goes downwards, and the contrary) and than disappear off the screen. It costs 10 PP per use. I think it would be fun to see those weapons for Ryu, what do you think about that?