Cheap, not so much, but there is a dagger that will proc a darkness (the one from guk) not sure if they're lore or not, but I guess if you really wanted to do it the daggers could be farmed.
Used to agro kite in Plane of Nightmare on live with my ranger. Would be in a group that didn't have a healer or something, so until we found one I would just kite the mob and occasionally cast Flame Lick, never lost agro. T
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