What an incredible scene! Your re-purposing of the rock walls and the world tiling materials are very interesting, no doubt you're using UE4 to its fullest. Thanks for discussing your methods and especially how you're going about lighting. I'm doing a similar underground-type scene, so seeing this is very inspiring. "Broken" sounds interesting too, love horror games. Cheers!
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You're developing a name for yourself it seems, too!