Ummmm, not exactly certain how they do it but the little red things inside it contain genetic samples of various things.

[ He moves slowly behind Hijikata, feet shuffling across the floor rather than taking steps. If these are the monsters from his world, then he knows that there's more than just that group. ]

The gods in my world can extract it and if there's enough samples, they can create...whatever it's a sample of. I'm not entirely sure, this is all just stuff we're taught. Only the folks on the towers upper levels would know, them and the Architects.

[ His eyes are trained to the shadows waiting for each to just move or blink, any indication that something is there. ]

I also have got to tell you, we're walking towards what is easily their den. These things love the dark, thrive in it. So any shadow you see that they could hide in could easily be hiding a monster. Like that.

[ He touches Hijikata's shoulder to draw his attention to their right where a black shadow cast on the roof suddenly gained a pair of red eyes before dissappearing. ]

They're probably going to be joining the rest of their pack.