EMP: An item which destroys all keycards in the world when triggered. This includes all items which have a keycard functionality, such as writable keycards, replica keycards, and any other types of keycards.
Flashlight: Gives you night vision and prevents and allows to see in the castle's basement when the light is off.
Keycard (writable): A keycard where permissions can be added to or removed from at the Keycard Manager villager. Also known as "Keycard".
Keycard (other): Other keycards for the doors, which are not writable keycards. Those keycards are gamemode-dependent. An example is the "Replica Keycard" from Conquest.
Old pickaxe: Can be used to obtain coal ore in the mine.
Siege Tower: Spawns a tower in front of the castle wall get on the castle walls. Can be destroyed by destroying any block of it.
TNT: When placed, it triggers immediatly and explodes. Available with variable amount of power.