Looks like lucky number 13, but it is in fact the KeeperFX 1.3.0 release!

Consider installing it with the web installer if you are a new user. Existing users can use our cute new launcher to update. It will clean up files from old versions.
Users who avoid the launcher, are reminded to install into a new folder.

What’s new in KeeperFX 1.3.0:

• Maiden (new Creature to use on new maps)
• Reworked Druid: New look and received a bird summon
• Sentry and Ballista traps
• Added Lua support (advanced mapmaking)
• Many other mapmaker options, including:
  • Branching campaigns
  • Temporary secret levels
  • Place traps and doors through script
  • Different game rules on a per player basis
  • New creature abilities, including ranged buffs
• Multiplayer stability improvements
• Fixed Power charging in battle menu
• Signed keeperfx.exe by SignPath Foundation, prevents false positive virus reports
• Some Deeper Dungeons levels fixed up
• New included maps (and removed a few unpopular ones)
• Game now available in Ukrainian and Brazilian Portuguese
• Much, Much more,...

https://keeperfx.net/news/21/2025-11-28/keeperfx-130-released