This update fixes just a few things for the stable 0.16.x version. Work on new features has already begun on the 0.17.x branch (see the dev builds if you're intersted in them!) These changes will be rebased to 0.17.x sooner or later. Another update with full support for 1.13.1 will follow as soon as possible after there is a Spigot build.

@Raigna despite what I said, I did find a few hours to work on it. Hope that helps

Changelog

• New features:
  • Reimplemented timeToNextLoot game rule
• Bugfixes:
  • Fixed /dxl lives NPE if the sender is not in a dungeon

Edit: These changes are merged into the 0.17 branch as of build #674 and higher.