Board Thread:Game Discussion/@comment-24117521-20131109175826/@comment-16147032-20131109181437

Energon cubes are farmed during raid boss events mainly, hitting bosses and seeding them is a possiblity, but the real efficient time to farm them is day 1 and 2 of raid events, when you can one cube most of the early bosses, each of them will give you an EC as well as the BC you spent, so free ECs. Farm as many as possible. If you want a decent few attempts at the x5 ruby bridge during the campaign events in the future, I would aim for around 200 ECs. More or less depending on how much you play or how badly you want the x5