For the waves at the start, have everyone stand in a room area that two bosses start at around a corner to LoS. Consecrate just outside the area. Everything will simply run to you and be grouped up
For the Arthas chase, have *everyone* stand next to the wall to LoS all the mobs (looking at the Witch Doctors). You can drop Consecration just around the corner and grab everything quite easily.
This zone is hilarious for Pally tanks.
"Upon an order we plead, with the lure of a song, a sacred song, to the moon and the stars. An illusionary light is here placed."