CrashBanUsers

Upon onPlayerLogin, crash-banned user's clients will be crashed.

How it works: Basically if the y coordinate ≃ -2,147,483,648 (Min x32 Signed Int) or 2,147,483,647 (Max x32 Signed Int), the client will crash. After inspiration from Jason's Plugin, I've made this feature plugin of its own. This plugin is different, seeing as the fact that $sender is also able to unban the player via command, also (within the crash-banned-users.json file it tells you who banned the player.

Usage:

Command Description Alias(es) Permission

/crashban Bans the player cban crashbanusers.command.ban

/crashunban Unbans the player cpardon, crashpardon crashbanusers.command.unban

How do I unban a player manually?

This shouldn't be necessary, as /crashunban already does the advanced option already, but it's here so you know what to do if you're bored. Just don't come running to me when there are issues.

In plugin_data/CrashBanUsers/crash-banned-users.json, delete the user's name.
In the players/ directory, search for the player's name, and do either one of the following:
(Easiest Option - Deletes their data:) Delete the player's .dat file
(Advanced Option:) Head to your favourite NBT Editor (For example, https://irath96.github.io/webNBT/ or https://github.com/jaquadro/NBTExplorer). Head to "Pos", and change the integers to any coordinate of your choice, so long as it's sensible.

Plugin's Inspiration:

I was playing around and found out (with help from @JavierLeon9966) that (in this case) the height integer was 32bit signed.

https://github.com/jasonwynn10/CrashAndBan - Jason's CrashAndBan Plugin (which is currently archived)