Below are Examples of how the hardcore hearts look like in-game:

Textures: Normal

Textures: With Absorption Effect

Textures: With Poison Effect

Textures: With Wither Effect

Image: Death Screen

When players die, they do not respawn and are instead put into spectator mode! In spectator mode you cannot pick items up, you cannot take items from chests and you cannot break or place any blocks! You can also teleport to other alive players and spectators
 

Spectator Mode Commands include:

• help: Lists all Spectator Commands
• info: Lists Rarity of Death/Respawn messages
• respawn: Respawns you
• nv: Enables night vision!
• nvd: Removes night vision!
• tp: Teleports you to the closest Alive Player!
• tpr: Teleports you to a random Alive Player!
• tps: Teleports you to a random Spectator!

Respawn Commands:
 

• /function respawn: Respawns yourself!
• /execute as username  run function respawn: Respawns a specific player! (replace the “name” in the command with the player’s name!)

Note: You will require Operator permissions (cheats enabled as well) in order to execute these commands.

Image: Respawning Example

Use “/function help” in-game to get how to use information:

Custom Death & Respawn Messages:

Death Messages:
[75%] Player died and can no longer respawn!
[20%] Player decided to head out early!
[4%] Player committed the die!
[1%] Player got YEETED!!
[0.1%] Player alt f4'd!!!

Respawn Messages:
[75%] Player resurrected from the grave!
[20%] Player rose from the dead!
[4%] Player reincarnated!
[1%] Player decided to live instead lol!
[0.1%] Player +1UP!!!

This addon was made by Jessie101!