This update is the first one with more than "guessed" support for 1.13 thanks to SpigotMC's new preview build. However, it targets the final version 1.13, so don't mind warnings like "[WARNING] Caliburn has a representation of the material DEAD_HORN_CORAL_WALL_FAN that does not exist in Bukkit" - that's just because I'm slightly ahead of Bukkit. Thanks to @Tiplish, I was also able to fix a bug where dungeon portals teleported players into the nether.

Depending on your feedback and whatever Mojang might still do to Minecraft 1.13, this build might be promoted to release status.

Also, please contribute to the discussion about the future of mob signs and waves. This is likely to be the main improvement of v0.17.

Changelog since the third release candidate:

• Code changes:
  • Updated to Caliburn 0.4.5 and DRECommons 4.3
• New features:
  • 1.13 compatibility
• Bugfixes:
  • Fixed dungeon portals teleporting players into the nether

Changelog since 0.15.x:

• Code changes:
  • Updated to Caliburn 0.4.5 and DRECommons 4.3
  • Use DRECommons PlayerCollection
  • No more direct NMS usage
  • Java 8
  • Got rid of as many deprecated methods as possible to make DXL ready for 1.13
  • Improved stability of instantiation system
  • ... and more

• New features:
  • Floor config setting to modify world environments
  • Readded sound signs
  • Sign localizations
  • Finished break / build rules
  • Per floor weather and time settings
  • Retry countdown for started dungeons instead of just for finished ones, also
  • Added a list for protected entities
  • Reworked global signs, also
  • Erroneous signs now print debug output at least in some cases
  • LWC integration
  • 1.13 compatibility

• Misc:
  • "0" is now the default value for timeUntilKickOfflinePlayer

• Bugfixes:
  • Fixed compatibility with CraftBukkit
  • Fixed Citizens support, also
  • Fixed reward bugs, also, also
  • Fixed sign protections, also
  • Fixed offline players not leaving the dungeon properly when the server stops, also,
  • Fixed death message visibility
  • Teleportations now consider pitch and yaw
  • Better error handling if HolographicDisplays is not enabled but hologram signs are used
  • Fixed saving health scales, also, also
  • Messages are not sent to players who are offline anymore
  • Fixed announcers
  • Fixed level requirement with keepInventoryOnEnter
  • Requirements aren't demanded anymore if players have the ignorerequirements permission node
  • Fixed NPE on portal cration
  • Fixed portal rotation (like, for real this time)
  • Fixed water portal protection
  • Fixed game sign protections
  • Fixed /dxl group show NPE
  • Reviewed global protection persistence, also
  • Fixed /dxl reload bug
  • Fixed instance deletion problems, improved stability, also
  • Eliminated circumstances where the game can be null
  • Improved dungeon sign error handling
  • Improved error handling if a world saved in a serialized location is unloaded
  • Fixed wrong allocation of players to instances after restart
  • Fixed NPE if the dungeon of a group / game sign is unknown
  • Fixed incompatibility with plugins that change sign blocks onSignChange
  • Fixed that players were teleported to the spawn instead of their last location after exhausting all lives
  • Fixed load order with Citizens & its addons
  • Fixed live counter, also
  • Fixed script signs overriding block sign blocks with their own replacement air
  • Fixed dungeon portals teleporting players into the nether