My players got in waaaaay over their heads--a first- and second-level party with one magic item against four wights! Ah, the rewards of nonlinear adventures! Actually, some bears were helping them out to honor the fallen shaman, but still. At any rate, with only the one magic weapon and having used up the few spells they had, they were at a loss as to how to attack. One of them decided to fashion a lasso and at least try to entangle the wights until someone more capable could get to them. I decided this could work--the rope wouldn't damage the wight, and there were rules in place for dealing with the situation: the whip.
I basically used the whip rules but gave the PC -2 to hit (I would have increased this dramatically for nonfighters and non-fighter-subclass PCs) and then gave the targets an additional +2 on their Avoidance saves. The dice were with them, though, and the warlock death soldier now goes by the epithet "the Wight Lyncher (You Have to See It Written Down)."