Your search for "How about a portable molecule collapser?" found the following result
How to Build a Molecular Disruptor - A book giving detailed instructions on how to build a molecular disruptor - an incredibly illegal weapon which fires fist sized balls of energy where any solid energy touches immediately loses all atomic bonds and crumbles to dust. As the disruptor ball isn't matter in itself, it will carry on going, getting gradually smaller until at 50m away it dissipates entirely. You could probably find most of the items needed to construct the weapon around the castle although getting a hyper-voxel core would only be possible from this machine.
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