Originally Posted by
bclumas
First of all, going for Twins while 4/13 might be a big step. While Twins isn't a difficult fight, it definitely has a significant DPS check. While I'm sure you're left with a lockout that has killed Iron Qon, next week I'd try focusing more on Horridon (assuming your heroic kills are Jin'rokh, Tortos, Ji-kun, and Iron Qon). Otherwise, go for one of the ones in the parentheses.
Now to your question. Our strategy involves using Xuen during the first night phase while Suen is channeling her first ability. The tank taunts her while she is spinning and brings her to the center. The person with Xuen stalls the completion until Suen is about half done with her cast. Once she is, we call for him to complete the puzzle, thus resetting her cast bar and slowing it down significantly. This allows for a solid amount of DPS on both Lu'lin and Suen. We save all remaining Celestials until the night phase. The goal of the night phase would be to get Lu'lin to approximately 45% on your first kill before she fades into the day phase. If you're meeting that mark, your DPS is on par.
We then use Chi'ji at the start of the day phase in order to pummel as much DPS as we can into Suen. Remember, in order for you to stop the tidal waves from hitting your raid in phase 3, Suen has to be dead. We also use Heroism/Bloodlust at the start of the day phase. Afterwards we use the remaining Celestials -- Niuzao after the first Nuclear Inferno and Yu'lon after the second (for mana).
Once the dusk phase begins, we again prepare Xuen and use it just before Lu'lin begins to channel her tidal waves, thus slowing them down and making them easily avoidable. The goal on your first kill would be to have only 2 (MAYBE 3) channels of the tidal waves, otherwise the damage will be quite high. Burn Suen while she's not channeling her ability, otherwise DPS Lu'lin while you're stacked for the Nuclear Inferno. After Xuen you can use whatever you'd like, including Chi'ji.
I cannot remember what we used at progression (Chi'ji IIRC), and now we kill Suen during Lu'lin's first tidal waves (sometimes before).
Good luck.