Herobrine's vault, The unescapable prison

https://www.youtube.com/watch?v=GBnbZenrCX4&ab_channel=HeWhoisOmnipotent

The prison that surpasses all prisons created in the past and in the future.

This plugin creates two commands: /confine and /release.

when you do /confine, all players online will be confined and unable to move an escape. 

/release to un-ground all online players

enderpearls and dying won't help you get out

this is truly the Unescapable prison