It's a very simple plugin. Each time someone dies, it will create a Message, blaming the player who died, kick all players, delete the world, world_nether, world_the_end and will finally restart the server!
It's not possible to recover the world, after that!

The plugin will also create a config file (plugins/ServerwideHardcore/config.yml), where you can change the DeathMessages, ResetMessage and KickMessage.
The Message have to be between Apostrophes! If a mistake occured in the console, just delete the config file an reload the plugin! You can use color codes in the message.
<player> is the placeholder for the player who died!
<killer> is the placeholder for the killer, works only in the DeathMessagePvP-String!

If something doesn't work, please let me know!