do you want it to hide you from other players too?

 

https://docs.skunity.com/syntax/search/id:181
Try this expression from skellet. This way you wouldnt need a plugin like essentials, though if you are using essentials it'd be easier to just go through it's commands.

One thing though, you'd probably have to account for people joining as they'd still be able to see. So you could keep the vanished players in a list like this for example; {vanishedpeeps::*} and on the join event, loop that list and make them not visible for the joining player too

 

you can just do

Code (Text):

1. hide player from all players

 

Ye! Think you still need to account for newly joining players though, I'm not at my PC to test however.

 

Code (Text):

1. command /vanish:
2.     permission:op
3.     trigger:
4.         if {vanish.%player%} is true:
5.             delete {vanish.%player%}
6.             reveal player to all players
7.             send "&cYou are no longer vanished"
8.         else:
9.             set {vanish.%player%} to true
10.             hide player from all players
11.             send "&cYou are now vanished"
12.  
13. on join:
14.     loop all players:
15.         if {vanish.%loop-player%} is true:
16.             hide loop-player from all players