repulsive device shouldn't be recoverable?

When freeing a child of the Tomb, the narrative indicates that the repulsive device fuses with the creature. It is easily recoverable as it just sits in inventory of the child, e.g. by domination. This makes it possible to free all four children and recover all the artifacts. This is fine as an exploit but is very un-immersive and makes the narrative incoherent.

It makes sense that the device would be destroyed.