Original Concept
"The Monument" by Pengzhen Zhang - https://www.artstation.com/artwork/28bYqx
Characters
"Dark Knight" by Nick Scott - https://sketchfab.com/Nickjjscott
"Elysia Knight" by Blue Spirit - https://sketchfab.com/Blue-Spirit

Assets modeled in Blender
Sculpted in Zbrush
Textured in Substance Painter & Designer
Assembled and rendered in UE5