In my fantasy novel, there is a rebellion that needs to be stopped. They have a weapon in a highly guarded room that is under ground. The team tasked with stopping the rebellion plans to drop several very heavy boulders from very high onto the ground above the room. The room is not large, but it has several rebellion workers and guards at all times.
Trick is, they don't want anyone to be hurt.
Question: How do they get people out of the room without tipping anyone off about what's about to happen?
More context: They have magic that allows one of them to become invisible and to go into the tunnels to the room's entrance. This is on a fictitious world, but it's a pre-modern society so stuff like pulling a fire alarm wont work.
Even more context: The magic is called "displacement." It allows you to "displace" an attribute between yourself and a target. For example, I can take the effect of gravity on a boulder onto myself and it's now weightless so I can push it into the air then it can be dropped from a great height. This is their plan. Here are it's rules:
- You must be able to see the target. The clearer your field of vision the easier it is to displace.
- You must be close enough to the target (seeing it from a mountain top is not normally enough). The closer you are to the target, the easier it is to displace.
- You must have similar mass to the target. The closer your mass matches your target, the easier it is to displace.
- Displacement is powered by the sun. Everyone "leaks" displacement energy constantly. The better "retention" you have, the more you can use to compensate for other deficiencies in your displacement (so you can be further from the target or have a less clear field of vision if you're better at retaining the sun's energy). Note: There's a special exception where displacement energy can be contained in a rare metal which the team has and will use to get one of them into the tunnels while invisible.
- You must "believe in the displaced state." This means you have to understand the physics behind the displaced state enough to convince your mind that the displaced state is reality.