Invocation

Advanced
Willpower
An Invocation Test allows you to boost your Power Roll when using Psychic Powers by an amount equal to your Willpower Bonus. An Invocation Test is a Full Action. During this time, you clear your mind through various means, such as muttering mantras, meditating, fingering psychic-foci and so on. A successful Test indicates that your mind is well prepared to touch the warp. On the next Round, you may add your Willpower Bonus in addition to any other bonus you add to your Power Roll.
Failure on an Invocation Test indicates that you are not composed enough to gain any benefits from your preparations. If you make a successful Invocation Test and then do not take the Focus Power Action on the following Turn, there are no side effects (aside from you possibly looking a little foolish).

Protective Invocation

You may use Invocation to draw psychic wards and sigils about you, summon up your mental energies and fortify your will against attack. Doing so requires an Invocation Test, and if successful you gain a +10 bonus for every degree of success to the next Willpower Test made to resist a Psychic Power. A failure by three or more degrees indicates you have botched the wards in a significant way, imposing a –10 penalty to your next Test instead. For every degree of failure above three, the penalty worsens by an additional –10.

The Willpower Bonus from Invocataion is gained on top of the base Willpower Bonus, essentially doubling it.