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Possible Spoiler Ahead:
Are you supposed to close the planar portal here? I can put the glowing sphere in here, but what else am I supposed to have, some kind of abysmal metal? Where do I get this? And all I'm getting an option for is to add some random object. Any help here would be greatly appreciated. Thank you.

Just realized that I had the smooth token in my inventory and once I used that plus the glowing sphere, it closed the portal.