Modeller/hobby level designer here
im going to make some dark evil assets..just because i can, i mean think of this:
A dark evil wizard from another planet has come to earth, the island of Limnos to be exact to find the artifact that will allow him to take control of the laws of physics and time and therefore the universe!, and you and you team of ragtag mercenaries that happen to have crashed their blackhawk nearby (because video game logic, thats why) are the only ones that have a chance to stop the dark alien wizard.
The mediterranean island has turned into a dark wasteland, dark spires towering out of the ground and all kinds of dark evil looking things, chaos gates, sacrificing tables...lava!
hows that for story line...hah!