"ruined" looking walls

having trouble getting the desired effect in this dungeon. this is the source map, with walls looking all old and crumbly:

image

now here's my map:
image


how can i get that "feel" with my walls? is it a sheet effect? if it's the "Displace" effect, any time I try to add it, CC3 crashes. same when I try to add "Wall Shadow, Directional". really need some help here.

edit: links work, though the thumbnail isn't showing?

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