(http://lesgrognards.net/forums/gallery/2_09_03_12_7_41_09.jpeg)
Ultraxion 25H has 248 million health (includes the 10% debuff) and a 6 minute (360 seconds) enrage timer (This doesn't factor in the 6 seconds Ultraxion uses for his hard enrage animation). The entire raid needs an average DPS rate of 688k. Tanks combined average about 35k. With 18 DPSers, they need to average about 36.3k DPS... All of this with 25 raiders clicking the button at the right times...
(http://lesgrognards.net/forums/gallery/2_02_03_12_7_16_24.jpeg)
Last night, the Old Guard managed to hit those numbers and exceed them by defeating Ultraxion 25H with 22 seconds to spare. Congratulations to everyone involved for keeping your chin high and clicking those buttons. More importantly, good work on finally gathering well for a group shot!