SafeInvisKills
This plugin makes it so that if you are invisible and kill someone your name is not shared to the server by showing a muddled name.
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SafeInvisKills
This plugin Allows you to kill players while invisible and not leak your name to the rest of your server and let other players peice together who killed who.
This is what it looks like,

Commands: /inviskill [on,off] This commands allows players with op to turn the plugin on or off without having to restart the server.