Board Thread:General Discussion/@comment-3190872-20121225192722/@comment-995908-20130323004410

Here's my suggestions for Dark/Earth and Light/Earth

Dark/Earth = Obsidian; Focuses mainly on offense (obsidian is a super-sharp volcanic glass), not sure what other aspects it could have

Light/Earth = Diamond; Focuses mainly on defense (diamonds are the world's hardest substance), with aspects of creating "purified" terrain for defense and of reflecting some attacks