Door

The particle accelerator's full blueprint was a mystery, at least for Gustav. He only recieved chunks of information at a time, and wasn't smart enough to work things out, even if he recieved the full blueprint.

These demonic rhinos, however, weren't as dense. They chattered through details like some scientific maniacs, and figured out what they needed next without even taking a look at the signal beacon, which Gustav had worked on.

Their intelligence was outstanding, so everyone around them felt happy to be dumber in comparison. 

Anyway, they collectively explained. "Since you were already looking for the particle accelerator, we're guessing that you already built an appropriate casing for the source of light particles?"

Their form of explanation was difficult to pick up, because they all spoke at the same time like excited parrots, and only one of them spoke loudly enough to be understood.