Well, the game I was thinking of was Tales of the Abyss, cuz their planet is 99.999% covered in Miasma!
I am thinking about getting Abyss. I loved Symphonia and Vesperia was pretty good too.
What's the overall gameplay like?
Anyway, thank you for the review! :D
Final Fantasy Crystal Chronicles also had Miasma! :)
Please contact me if you would like to use this in a project. We can discuss the details.