Join animation

Does anybody know the code for the join animation in this video:

I would like to add it to a plugin

 

You can take look at source code of this plugin, it's not private source

 

Where is it?

 

Here: https://github.com/Enrick3344/GuardianJoinEffect you can see join title if he have it

(Yo FreakingDev Stop swearing at me for no reason I got this plugin from https://github.com/Enrick3344/GuardianJoinEffect now leave me alone ,Thank you!)