If anyone knows about this game...

I played it quite long ago so totally forgot the name and characters, but it was an anime style game. The story is about some mages and warriors created a supreme weapon to destroy evil, however it turned out that they created two living weapons -two baby boys. One of the mages corrupted by the evil soul and raised one of those two into a tool to do dirty jobs for her while the other growed up peacefully. Eventually they meet and clash each other. This game has a unique battle system, characters don't use mana but absorb power of elements around them. For example, you absorb earth element if you stand on sand, dirt or rock; tree element if on grass, mold or vines; fire element if there's a fire nearby like torch of lamp... and so on. Does it ring any bell to you? Please let me know the title, thanks a lot.:D