With most powers, you want to start out by getting your PI setup. With celestial, there are 3 powers that "setup" your PI. Divine light, Retribution, and the SC generator (I don't use it, so I can't recall the name). But wait, there's more (and this one of the secrets of celestial). The corrupted version of Divine and Retribution will also setup your PI. Meaning, don't waste your time trying to setup PI from the start, you'll be able to keep it going through combos. So, if you start your rotation (let's hope your tank has aggro) using plaque with the full combo, you've already got your PI setup with corrupted Divine light. If you start your rotation with Wither, your pi will setup with corrupted Retribution. Start with plaque, as you light your hands at the end of plaque, you hit Divine light (no combo). Divine light and corrupted Divine light, both hit hard. So clipping this as your start, is going to land you 2 really big hits at the start of your power rotation. A suggestion for a rotation to try: Plaque clip Divine, Wither combo clipped to heat vision, back to plaque combo (Divine light is still on cool down), clip to wither combo, clip to heat vision. (Repeat) and get really good numbers. If you're up close, you can replace Wither with blight combo, and get about the same numbers. Blight can also hit hard even if the pi is not setup. So in alerts like VMF, if you've just used plaque, and the enemies die (while plaque is cooling), you can lunge the next set of adds and go straight into blight combo, heat vision or Wither to finish them off. Celestial dps is very active response based, in that you have to know which adds will die faster, so you can position yourself for the most damage, with whichever combo you need to get the job done. Blight is direction based, meaning the last hit of combo needs to be facing the adds to be hit. Another thing you can do is the death Mark combo, as when the shield breaks, it hits hard. So you can setup the shield before jumping into the adds, and get a nice hit in the short seconds it takes to break the shield.