There is a geo group that has both ATK +50% and DEF -50% along with Attacks +1, so that would be the group to go for. I have most of the rank 39 legendaries along with the Apocalypse from the Demonhall Mirror. I don't have a legend Cosmic Blade yet though.
PSN: aces4839 Of course we can talk, zam, dood. - Prinny from Disgaea 2