Apologies if anybody spoiled this already, but in the Valley of Kings, right above where you finish the first mission. (To the right of the vex gate) Jump all the way up the rocks and look on down to infinite cabal spawns! Wheeeeeeeeeeeeee. I happened across two randoms doing this and so endeth the lesson. I took a video but i can only post to fb and you all are not getting my facebook lol.