Welcome to Isolation.
This is a symmetrical map with an above ground and underground level. On top you have grassy natural area. On the underside you have caverns of what look to be remains of the flood.
There’s a ghost on the lower level.
Notice not only the impressive sky, but also the secrets in this picture.
What looks to be Mark V armor and Hellghast from Killzone.
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UPDATE: Heres a better picture of the Mark V Armor: