Is there multiplayer on GoG versio of Dethkarz ?

The store page of the game says "Single player", and no allusion to multi.
The Screenshot of the menu has a "Multiplater" option.

The PCGW Dethkarz, said "LAN Play", regardless of the version (retail or Gog).

If there is multi, do you know the protocol ? Is it IP or some old abandoned protocol ?

Thank you for yoyr answer.

LAN over internet is probably a lot better.

This right here. I wish Tunngle was still a thing, but there are other options. It is probably harder to find more people who are willing to play this online than actually setting up connectivity ;). Cheers

Thank you for this answer. Worth trying...