I know many may think "Why not use Mass Dispel?" so here's why I wrote this:
When my guild does a harrower, we use 6 x Rising Colossi and that way we can sit back and watch and no one gets pulled in and the harrower does not move. When the harrower casts a revenant however, it might latch onto a player, or it might start damaging one of the rising colossi. You CAN just discord it so it makes it a lot more difficult for the rev to do damage (and the harry can't cast another one), but that can be a pain, so it's easier for my discord/mage/protector to simply dispel them, hence the targeted NORMAL Dispel instead of Mass Dispel (so we don't make all the R.C.s go POOF!)