For the Conquest event (that just ended, along with the previous one), the battle with Luthen Rael (to get his shards) is bugged. The global modifier (Democracy?) doesn't work. The leader can't die while there are other allies, but the ability to kill the leaders doesn't appear, for either side.
I don't know if it makes it easier or harder to beat, but I know I can't yet beat it how it is now and I think I'd have a better chance if it were working properly.
Thanks