So, Baraccus left Richard an empty book in order to teach him how to use his powers as a war wizard. Richard finds the book and understands the eleventh rule. The way I see it is that a war wizards gift is called through need, but can be used at will - as Braccus could - once the eleventh rule is understood.
How is it that Richard understands the rule, but cannot use his power at will?
If I am wrong about this, then how did the war wizards of old, i.e. Baracuss use their powers whenever?