They drop from the Lunar Fragments/Golems when he's doing Megaflare at the beginning.
I read that they drop from them AFTER megaflare phase. During that first minute, fragments don't turn into golems and we got a 0% drop rate from lunar fragments in the beginning. We ran it 10 times and only the pld was able to survive megaflare with sentinel, and once was able to raise a whm, who died quickly after.
Basically, you need to super buff people, go as classes, use sentinal and every other buff, hope to live, and then chain raise everyone. At least, this is the only thing we came up with...
We plan to farm some Overspctaled crystals and use them to buff as well, they might help. Edited, Aug 14th 2012 2:55pm by Louiscool