This plugin is under development, but it is already there:

• Very simple and convenient Vanish
• Phantom blocks

What is its advantage?

• Vanish - this Vanish saves player's information when: rebooting, logging out, logging in, and so on, you can give vanish to a player even if he is not on the server!
• Phantom Blocks - a block that will be seen by the player who put it and the one who used it.

Commands:

vanish:

Description:

Hides a player from others on the server, making them invisible to selected players or everyone, depending on the parameters. Supports three visibility modes: ALL: Hides the player from everyone. EXCEPT: Hides the player from everyone except specified players. ONLY: Hides the player only from specified players. Can be applied to the command issuer (self) or another player (online or offline). Persists vanish status for offline players, applying it when they join.

Parameters:

• /ac vanish (no arguments) - Vanishes the command issuer from everyone.
• /ac vanish <player> - Vanishes the specified player from everyone.
• /ac vanish <player> -p <exception_player> - Vanishes the specified player from everyone except the exception player.
• /ac vanish <player> +p <exception_player> - Vanishes the specified player only from the exception player.

unvanish:

Description:

Removes the vanish status from a player, making them visible to everyone again. Can be applied to the command issuer (self) or another player (online or offline). Clears saved vanish settings for offline players, ensuring they join normally next time.

Parameters:

• /ac unvanish (no arguments) - Unvanishes the command issuer.
• /ac unvanish <player> - Unvanishes the specified player.

pblock:

Description:

Creates a "phantom block" item that, when placed, appears as a specified block type but is visible only to the issuer and one other specified player. The block is not physically present (it’s set to AIR on the server) but is rendered client-side for the designated viewers. Useful for creating private decorations, traps, or visual effects.

Parameters:

• /ac pblock <block> <player> <block>: The block type (e.g., STONE, DIRT, GRASS_BLOCK). <player>: The other player who can see the phantom block (besides the issuer).