"Unsettling Powers should (generally) be used as a general check against PWR and cost 10 WPR per round."
I've always assumed that any use of an unsettling power requires a thing to make a general check against PWR to activate the power, but some of the unsettling powers in the book have no WPR cost per round listed. Do those just automatically cost 10 WPR per round, or is there no WPR cost per round associated with them?