Citadel

Citadel is a plugin (source) which allows blocks to be reinforced, making them hundreds or thousands of times harder to break. Reinforcements are tied to a Namelayer group and can be bypassed by players on that group. Many civ-specific blocks such as Snitches and Bastions only become active once reinforced.

Reinforcing
The most common method of reinforcing is running, then punching a block with a reinforcement material in your hand. Reinforcing a block always costs one item of the reinforcement material. This item is returned only when a player who is on the reinforcement group mines the block or changes its reinforcement level.

There are other reinforcement modes which afford different methods of reinforcing blocks other than punching it - see.

A reinforced block will also protect any crops growing on it. For instance, reinforced farmland (tilled dirt blocks) will prevent wheat growing on it from being broken in a single hit. The reinforcement of a crop is linked to the reinforcement of the block it is growing on, so damaging one will damage the other.

Materials

 * -|CivMC=
 * -|CivClassic 2.0=

Easy Mode
Use  or   to enter this mode. Easy mode is like a permanent reinforce mode - it acts like reinforce mode in that you can punch blocks with reinforcement materials to reinforce them, but it will not give you error messages whenever you punch blocks with an item that is not a reinforcement material. If you enter this mode and forget about it, be careful about punching things with valuable reinforcement materials like diamonds!

Fortify Mode
Fortify mode will reinforce all blocks placed with a specific reinforcement material while in fortify mode. To enter this mode, hold a reinforcement material in your hand and type  or.

Advanced Mode
Advanced mode is similar to fortify mode, but allows matching an arbitrary number of block types with different reinforcements. To enter this mode, hold a reinforcement material in your off hand and a block in your main hand, then type  or. While in this mode, whenever a block of the selected block type is placed, it will be reinforced with the selected reinforcement material. Unlike fortify mode, only this block will be reinforced when placed, not all blocks.

You can repeat this process to assign as many block/reinforcement pairs as you want. This means that you could reinforce iron doors with diamond and obsidian with stone while in the same mode, for instance.

All block/reinforcement pairs are forgotten when you exit out of advanced mode, and must be re-associated again whenever you re-enter advanced mode.

Toggle Modes
These modes allow you to retrieve information about reinforcements or affect reinforcements in some other way besides creating a reinforcement. These modes can be toggled on or off independently of a reinforcement mode or of each other. In other words, you could have info mode, bypass mode, and reinforce mode all active at the same time.

Insecure Mode
Insecure mode allows you to punch reinforced blocks to turn them to an "insecure" reinforcement. This mode is entered via  or. A container which is insecurely reinforced will allow hoppers to move items in and out of it, in contrast to a normally reinforced container, which will not.

Info Mode
To toggle this mode, type  or. When you punch a block while in this mode, information about the reinforcement of that block will be displayed. If the block is not reinforced, it will say so, and if it is reinforced it will tell you what the reinforcement material is and how much health it has left. If the block is reinforced to a group you have permissions on, the group name will also be displayed.

Bypass Mode
To toggle this mode, type  or. This mode allows you to bypass reinforcements to a group you have permissions on. The reinforcement material will be returned when you break a block in bypass mode. Without this mode enabled, you will be forced to break blocks over and over again just like a normal player, even if the blocks are reinforced to a group you are a member of.

Breaking


Whereas normal minecraft blocks need only be broken once to actually break, reinforced blocks must be broken hundreds or thousands of times, depending on the material used to reinforce it. Tool durability does not decrease when breaking reinforcements, only when performing the final break of a reinforced block which results in its actual breakage. This means that breaking a reinforced block costs only 1 durability from the tool used.

Explosions will do one reinforcement damage to all blocks in blast range. This only applies to blocks that the explosion would have been able to damage had they been unreinforced.

Acid Block
An acid block is a particular block (usually a gold block) which can be placed underneath a reinforced block to "dissolve" the reinforcement. Depending on the reinforcement material used, the acid block could take hours or days to mature and fully dissolve the reinforcement. As many acid blocks can be placed at the same time and they all mature at once, acid blocks can be much faster at breaking reinforcements in some circumstances.

To use an acid block, place the designated acid block type underneath a reinforced block, then reinforce it with the same material that the block you're trying to dissolve is reinforced with. Wait the designated maturation time, then come back, look at the acid block, and type  to both pop the acid block and break the block above it.

Note that acid blocks do not gradually do damage to the block above them - they only have an effect once  has been run on them, and   will only work once the acid block is fully matured.

The  command has a range of 40 blocks and can be used to remove many acid blocks simultaneously, as long as they are all in line with the player's cursor when the command is issued.

Acid blocks are why almost all defensive infrastructure (such as Vaults and Bunkers) are built at bedrock: you cannot use acid blocks on blocks which are built directly on top of bedrock.

Acid blocks are often used to clean up Obsidian Bombs.

Decay
Reinforcements can decay if nobody on the group they are reinforced to logs in for a certain amount of time. For instance, if nobody on a group logs in for 3 months, all blocks reinforced to that group will get a damage multiplier of 2 (meaning they require half the breaks to break).

Since a single player on the group logging in is enough to reset decay, decayed reinforcements are uncommon.

Redstone Interactions
TODO rewrite as paragraphs


 * Reinforced buttons will only emit a signal if someone from the namelayer is nearby (distance?)
 * Comparators cannot inspect the content of a reinforced container block (e.g: chests, furnaces, droppers)
 * Droppers and hoppers will not transfer items if the destination block is not on the same reinforcement group.
 * Blocks can not be attached to a reinforced redstone component (e.g dropper, dispenser, hopper?) if not on the reinforcement groups.
 * Reinforced doors, trapdoors and fences gate will only respond to a redstone signal if someone on the reinforcement group is less than 7 blocks away from it

Advanced features
TODO clean this up, move to other sections


 * Note that reinforced blocks are not affected by gravity (e.g. reinforced sand will float). However if the block by default breaks when block beneath is removed, it will break even if reinforced (e.g. rails whose base is broken will also break).
 * Being in reinforcement or fortify mode will prevent the use of citadel buttons. Walking over pressure plates while in this mode will reinforce them to currently selected group.
 * Reinforce leaf blocks and destroying the tree they are apart of will lead to loss of reinforcement.
 * It is possible to double reinforce a double chest by placing it while using.

Known bugs

 * Placing a reinforced button/sign and breaking the block at the base will make it drop but will leave a reinforced air block behind. As this is an exploit its use should be avoided.