• core rules for Jeskyně a draci + urban sandbox campaign
• Kalus offers an open world full of magic, NPCs, cats, and conspiracies
• the campaign works across systems – find free support online

This set is the perfect start or expansion for your RPG library. It includes the core rulebook Jeskyně a draci – a modern Czech version of the D&D 5E rules – along with the campaign module Záhady města Kalus, set in a living city full of magic, conflict, and morally questionable choices.

Kalus is an open sandbox where you can help, hinder, build relationships, and most importantly – be careful not to upset the cats. The game is system-agnostic, and supplements for various systems are available for free download on the publisher's website.