when casting Infernal Spheres during combat if you are hit with a knock or control effect as you are casting it the spheres show visually as active on screen as well as on the powers bar, yet they do nothing and are unable to be dismissed, resulting in the loss of 1 of your encounters, the only resolution I've found is to open the powers window and swap Infernal Spheres with another power, then swap it back.
this has been happening since at least module 12....
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It basically wastes a slot just by existing and should probably be thrown into a bug report along with powers like Dreadtheft, because assuming that its uselessness is unintentional is the kindest and most generous way to go.
Contagion - Cleric
Testament - Wizard
Pestilence - Ranger
Dominion - Paladin
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