Hardcore Mode with Spectator Mode

In hardcore mode, you cannot respawn after death. Whether killed by a Creeper or swallowed by lava — there are no second chances. This is what makes this mode interesting. After death, you simply won't have a respawn button. You can only become a spectator. Health hearts have a different appearance. You can disable natural generation to increase difficulty. You also cannot change the difficulty level. Cheats cannot be enabled. Even switching to operator mode won't save you. Added compatibility with 1.21.31 in the new version.