Whatever you do, do not put the demon core in a blender. A bad time will be had by all.
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"Well, that does it."
Whatever you do, don't pull out that screwdriver.
The outside of the demon core is a shiny metal sphere, wheras yours looks dull, like stone. Its no wonder the textures look off when the material isnt right. I see why you did this, though, reflective metal materials always look bad in an empty scene. get yourself an hdri or something to create interesting reflections, then turn up metalness and turn down roughness.
Plainly Difficult video about the demon core if you are curious and have 20 minutes
Oh look a screwdriver, let me just use it real quick. Nothing bad will happen I'm sure.
They look pretty good to me!