Gree made it clear in the announcement for the event that guilds would be open, not closed, for this raid boss. It was not something that they ignored or overlooked, they pointed it out. I need to emphasize that, Gree pointed out to the KA community that this was possible. It cannot be cheating if Gree told us about it in advance. It is not even a loophole. It was part of the game design. It was also an opportunity to work not just within, but between, guilds. It was the most fun I have had playing KA in a long time, and I am pleased to say I probably fought alongside a half dozen or more guilds, from top 25 to top 500, meeting lots of new players along the way. Awesome event. I mean it.