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No reason people should have to mill around waiting for empowerment to fade so they can sell/gift weapons to others.
Why not introduce some kind of procedure for removing empowerment? You could have it require the runewarden to have contact with the ground (like empowerment) and make him/her stay still for longer than runeblading takes, and even increase the cost, willpower-wise, if that seems reasonable, though I can't imagine any argument against the removing of the empowerment status. To help make things cleaner, the runeblade should probably be required to be smudged of its enhancing-rune (pithakhan, eihwaz, nairat, hugalaz), just so there aren't extra runes on weapons floating around.