Heyho,
some of you might know the fight against Teron Gorefiend. He randomly casts a debuff that makes you a ghost. If you are the ghost, you have to kill four skeletons with the abilities of your ghost. One of the abilities is "spirit lance", a single target shot that adds a slowing debuff on the target which is stackable.
Now, if you use a macro to cast the spirit lances, the debuff will be automatically stacked as high as possible (in one shot), but it only does normal damage. Use this makro:
Happy holidaysCode:/cast Spirit Lance /cast Spirit Lance /cast Spirit Lance /cast Spirit Lance /cast Spirit Lance