Try the strategy that we use, you need two titans up on the daughters platforms with blessings, weapons, and touch of malice. The titans take care of the ogres and the plate guardians only need to toss a grenade to help the titans then the focus on their Knights while on the plate. The ogres do not last long, and the Knights can be killed before they even take a step! The last Knight is the responsibility of the Titan team. We have completed the Oryx challenge and regular runs doing this method.