Don't hang me if this has already been covered, but I searched and found really nothing on this topic other than low man Omega runs.
My LS tried a 12 man Ultima yesterday. We have cleared Omega 2 times with around these same numbers and while the Omega isn't easy, when he went nuts around 20%, we were able to zerg him down for the win both times we tried.
Ultima on the other hand was a different story... 12 people:
Party 1
NIN/WAR
NIN/WAR
WHM/BLM
SMN/WHM
RDM/DRK
SAM/THF
Party 2
BLM/WHM
BLM/WHM
BLM/WHM
BLM/WHM
BRD/WHM
WHM/BLM
Our strat was very good for 80%... We had absolutely no trouble with Ultima until he hit 20%. I was one of the 2 tanks and I regretted not eating sushi he was so easy to co-tank with the other NIN. We slow killed it, with BLM low tier spell dotting it all the way down to make certain not to pull hate off the NIN's. When he got to 20%, we just seemed to lose control.
My question is, what do people do in order to get this thing killed once it hits less than 20%? Citidel Buster was handled pretty well and people ran out of range of it so that wasn't really what wiped us. What do people suggest we do with only 4 BLM's? Should we have everyone rest up @ 21% and prepare for an super zerg while the RDM chainspells Stun?
One thing to note though is that we found a way to cancel Citidel Buster completely. The SMN took hate with Diabolos on one them and dismissed him under at under 5 in the countdown and it stopped it completely.
Any tips would be appreciated on what we could do to effectively kill him once he "goes nuts" under 20%. Can NIN/DRK hold enough hate off the BLM's to make the difference under 20%?
Edit: After zombie tactics, we wiped at 4%...
XI Wiki

the BLU did well with Head Butts and etc.. SAM I -think- helped plant hate >.> I was one of the SMNs ;3 paid more attention to what I was doing mostly...
