Trinkets of Interest

The only real issue with using it as a harvesting device is how it seems to require it's victim's permission before it can begin consuming them. This could be attributed to a simple need to remain efficient, A resistant victim taking more energy to consume than they would return, but I would say there's a certain degree of sympathy magic at play here as well. The very willingness of the human to give, however ill-informed or misguided, is the key which allows the Beastheads to take.

When interacting with a demonic host, it becomes a game of take versus take instead, something all but the most critically wounded demons would be able to do, as the Beastheads is built to be used, its ability to hold on to its own power is distinctly weak.

Any version of the beastheads that exists can pull information from any timeline that contains any other Beastheads, connecting each to the other in a sort of network that runs off dark magic and human souls. The Beastheads is not limited to merely seeing or revealing alternate timelines, either. When under pressure, it can swallow a target and physically displace them into that timeline, too.

sending something to another timeline is tremendously energy intensive, but allows the statuette to dispose of threats that would otherwise destroy it. If the displaced persons are able to alter the timeline sufficiently, however, they will be rejected as foreign bodies, forced back to their native spacetime along the same thread that sent them there.

This is why Dante and Beryl were ejected from the alternate timeline, despite never laying hands on that world's Beastheads. Defeating Mundus was a change large enough to force them home. Likewise, their lingering connection to the Beastheads in their own dimension meant they were sent back to a location very close to it, which is how they ended up in Chen's lab, where it had been moved while they were away.

One thing that is never touched upon in the book is whether or not the Beastheads is something singular. It could be an artisanal statuette, or it could be one of a set. Something very rare, but replicable.

Personally, I favor the latter option. There's no cannon to support it, but making the Beastheads unique would mean it's stuck in a bit of a mediocre book where it can never be touched again. I've seen a few people use Geryons and OC demons to send DMC characters to other timelines, but I think the including the Beastheads as a core plot macguffin in more things could be a lot of fun.

The inspo image: