At random against elite foes or when a Burglar starts one, everyone on your team can pick one of four colors, which stand for damage, healing, damage-over-time, and mana recovery. This is a nice bonus, lowering the boom on them or picking you back up. But scroll down the page to combinations. Some combinations of colors give bigger bonuses, mostly poker hands of flushes, straights, and full houses. If you can get people to do the right colors in the right order, the fight is pretty much over right then.
And that’s the hard part: getting people to do the right colors in the right order. Even getting people to stick to a flush other than “go red!” seems to be very hard.