Hellstrike

(Least; 2nd)

You gain a Competence bonus to one type of combat maneuver equal to your Charisma modifer, if any, up to your Warlock level. You can choose from Bull Rush, Charge, Disarm, Fent, Grapple, Overrun, Sunder, or Trip actions. You can't apply this bonus to two different combat maneuvers at the same time, and a second invoking of this invocation automatically dismisses your previous invocation.

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this was inspired by some of the conversation that took place on this thread, about a different invocation i created:

http://www.giantitp.com/forums/showthread.php?p=4528682