I've always been fascinated by the Twelve since the first day I played this game. Imagine the joy I felt when they announced they're making an Alliance Raid focused on the Twelve. And they didn't disappoint, lore-wise.
Not the gameplay though. It's way too easy for 24-man raid. I think the biggest reason is that the room for error is too generous. You can stand in wrong position while the boss is casting a spell, and still have plenty of time to adjust before the spell goes off. They should make the casting faster, so that mistakes get properly punished.