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Citadel allows you to reinforce your blocks.

You use stone, iron, or diamond as a material to protect your block.
If a block is reinforced, it will take a set number of breaks to be destroyed. If the block is a container, you have to break it the same amount in order to open it.
To reinforce a block, hold a reinforcement material in your hand, type '/ctf [groupname]', and then start placing blocks. They'll be reinforced under the group you typed.
Groups are managed by the plugin LayerAfterLayer, and can be made with '/layerafterlayer'.
You can exit reinforcement mode by typing '/cto', and you can check reinforcement information using '/cti on'.
Using '/ctb', you can destroy blocks which you have reinforced and receive back the block and reinforcement material.

baby lock them
doors and turn
the lights
down low