This feels blue and black, not blue and green. The life payment, tricky 'mind possession' flavor, all of it adds up to blue/black in my opinion. Fungus can easily be a black thing, too.What led to this being blue/green?
I originally had it mono blue as a magical parasite. I changed it to G/U right before I posted it. You;re right that it should be Black and Blue though. I'll change it.