OK so here's where we're at after reworking the wall effects to give it height.

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Name:	Guirren Villus Crypt Level 1.jpg 
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wdmartin here are the settings I used to fix the walls. They are the same as the cave.
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Name:	Inner shadow.JPG 
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Name:	Bevel and emboss.JPG 
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After i drop some assets into the map I'll try your suggestion for the shadow.