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Now supports Minecraft 1.21. Note that packetevents v2.4.0 is required
To install the plugin, download the latest release from the releases page and place it in the plugins folder of your server. Also, make sure to install PacketEvents in the plugins folder.
All messages can be customized in the config.yml file. The default configuration can be found here.
[!IMPORTANT] This plugin is dependent on PacketEvents v2.3 to intercept packets and modify the player's visibility.

Spectre is a Minecraft plugin that allows the player to control the visibility (hidden, hide-partially, show) of nearby players.