[@Kiyran]

Yeah, when you mention it, I started to wonder as well. But I don't think dark and light can combine and create an unlimited power. Light creates darkness. Light can be created by light Aedis so that he can shine it, creating shadows and darkness, thus powering dark Aedis, but dark Aedis cannot create light again for light Aedis to absorb, because darkness does not create light, so I don't think you can buff each other around and make an unstoppable team. But still, there is an unlimited possibility of buffing each other by combining other elements, like:

Fire melts ice creating water for water Aedis
Fire evaporates water creating steam for air Aedis
Fire shines for light Aedis
Ice + Steam = Water for water Aedis
And many more.