Gist report
Server crash after a few minutes after loading world.

Can provide Curse Import File for instance.

Edit: Most likely the result of removing all loot for the challenger mobs.

Thanks for letting me know, I've been wanting to work on them anyways so I went ahead and did a decently-large overhaul

Uploading 1.11.x and 1.10.x versions to curse now :)

Thank you.