Vodkafairy said:powercap only raises the cap of your powerpool
so you'd need 15 powercap and 40% power for example max on powercap is 50, so with 50 powercap you could get 75% powerpool
items with powercap you might be able to use are cloak of the zephyr, ring of calm, lightning embossed chain (?) helm, etc
or search for rogs