Our TG Caption

You begin to investigate the box but you struggle to figure out what kind of box it is. It almost acts like a puzzle box but it is tricky to open. Eventually you manage to open the puzzle box and inside, you find that its a form of core? The core is round in appearance but it is very dark in color, seeming to have a dark frame but in its core it is pitch black with some form of substance. It seems to be placed inside like control rods in a nuclear reactor however it seems it could be taken out.