Respawn Anchor

The respawn anchor is a block that allows players to set their spawn point in the Nether at the expense of glowstone blocks.

Breaking
Respawn anchors can be harvested with any pickaxe at or above diamond tier (diamond/netherite). The respawn anchor keeps its current level of charges with the Pick Block option in Creative mode, and it is unique in the fact that this does not work on blocks with different states like the redstone lamp or daylight sensor.

Crafting
While the ingredients to craft a respawn anchor are all native to the Nether, they are also obtainable in the Overworld: glowstone can be obtained from trading with villagers or wandering trader, or crafted from glowstone dust dropped by witches; crying obsidian can be found in ruined portals and obtained with piglin bartering.

Respawning
The respawn anchor is used to respawn in the Nether, even if the player leaves the Nether. Once the block is charged, it can be to set the player's respawn location.

When crafted, a respawn anchor has no (zero) charge and can't yet be used until charged.  a glowstone block (not glowstone dust) on it adds a charge. The anchor accepts up to 4 charges, and the charge level is indicated by a dial on the side of the block.
 * Charging

The first charge makes the respawn anchor glow with a light level of 3. Each glowstone after the first increases the light level by 4, up to a maximum of 15.

To set the player's spawn location to the respawn anchor they must it, just like one does with a bed. The anchor must at least have one charge, and it must be in the Nether. A confirmation appears when the player's respawn location is set. Other players can also set their spawn point to the same respawn anchor. Each respawn uses up one charge, even if used by another player.
 * Setting respawn

Using a charged anchor overrides any other spawn location the player might have had, as with a bed. The respawn anchor does not serve as a backup spawn point to a missing or obstructed bed.

Upon death, the player respawns next to the anchor, and it loses one charge. If a player's respawn anchor is destroyed, if its charges have been exhausted, or if the area around it is made unsuitable for respawning, a message appears saying "You have no home bed or charged Respawn Anchor, or it was obstructed", and the player respawns at the world spawn point. Returning through an end portal is not counted as a respawn against the charges.
 * Respawn upon player death

A respawn anchor can be shared among several players. When shared, remaining charges are shared as well. In Hardcore mode, the respawn anchor does not resurrect the player, but may still teleport them and consume charges.

Exploding
If the player attempts to set their spawn at a charged respawn anchor in the Overworld, the End, or custom dimensions in which they are disabled, the block explodes (and is destroyed) similar to when a bed is used in the Nether or the End. The explosion has a power of 5 and sets fire to surrounding blocks.

Redstone component
When charged, a redstone comparator gives a signal depending on the number of charges: 3 for one charge, 7 for two charges, 11 for three charges, 15 for four charges. An empty anchor gives a signal of 0.

The respawn anchor can also be charged with a dispenser.

The respawn anchor cannot be pushed by a piston.

Mobs
Hoglins run away from respawn anchors.

Note blocks
Respawn anchors can be placed under note blocks to produce the "bass drum" sound.

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Trivia

 * The active respawn anchor's top texture is actually translucent, as this texture is a direct modification of the nether portal block texture. This translucency is not visible in-game as solid blocks with transparent pixels are always rendered as opaque.
 * The respawn anchor's ambient sound is in fact the nether portal's ambient sound played backward.