Bastion
Bastion is a territorial protection system based on reinforced beacons and conduits. Whereas Citadel increases the durability of individual blocks, a bastion restricts selected actions within a surrounding field. Players carrying a matching interaction key are exempt from the field’s restrictions.
City bastions
A beacon becomes a city bastion after it is reinforced with Citadel and bound to a key. Its radius is determined by the beacon pyramid tier.
| Pyramid tier | Radius |
|---|---|
| 1 | 20 blocks |
| 2 | 30 blocks |
| 3 | 40 blocks |
| 4 | 50 blocks |
City bastions prevent unauthorized reinforcement and hostile mob spawning within their fields. They remain active when the beacon beam is obstructed or the beacon itself is not activated.
Each unauthorized attempt to reinforce any block within the field applies two damage parts to the bastion. Ten such attempts remove one point of its Citadel durability. Nearby city bastions within one-quarter of the field radius also receive one damage part per attempt, so 20 overlap hits remove one durability point. Overlap damage does not chain to additional bastions.
Vault bastions
A conduit becomes a vault bastion after it is reinforced, bound to a key, and placed in the locked state. Its radius follows the vanilla conduit formula, floor(frame blocks / 7) × 16.
Vault bastions prevent unauthorized block placement, bucket use, ender pearls, chorus fruit, teleports, piston entry, fluid flow, hostile mob spawning, and related actions. The teleport restrictions also apply to /tpa and /tpr when the moving player lacks access to the field.
Vault bastions are commonly used around exile pearls and high-value storage. Each blocked action within the field applies two damage parts to the covering bastion. Nearby vault bastions receive one overlap damage part under the same non-chaining rule used for city bastions.
Access
A matching key carried anywhere in the inventory bypasses the associated field. Keys stored inside inventory shulker boxes are included in the access check.