From publisher blurb:
Hidden in the depths of the most secluded jungle is a plateau dominated by monstrous beasts and primal tribes. This place holds uncountable amounts of gems, gold and silver within long forgotten caverns, protected by reptilian monsters, humanoid beings and powerful shamans. Are you brave enough to explore the Kalunga Plateau?
These products are unofficial content for Old School Essentials, but is also compatible with most OSR games.
Issue #1 is a toolkit containing a setting, rules for character creation, a list of new spells, new creatures and many tables with content to play at the Kalunga Plateau; an unknown place hidden in your campaign setting ready to be explored.
Issue #2 offers expanded content containing a lot of details about several tribes from the Plateau, many information on the creeds, spirituality and religions from the tribes, and details about the 4 great kingdoms in the Plateau.
Issue #3 expands the Plateau into the Underground, an area which houses the Orb, a magical font of life, and lots more tables, new creatures and encounters, and details on the flora of the Plateau.