The Overworld and Beyond (13th Age Compatible) System:13th Age Trail of Cthulhu is a

Trail of Cthulhu is a complete game of investigative horror set in the 1930s based on the work of HP Lovecraft

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The Overworld and Beyond (13th Age Compatible) System:13th Age Trail of Cthulhu is aA Whole Campaigns Worth of Planar Themed Adventure! The Overworld and Beyond is a planar hopping adventure for 13th Age by Ash Law. The Carrow Hills It includes a backwater setting you can stick in your world that includes towns, wilderness, and gates to other worlds. Use this setting for a 1st 4th level sandbox as weirdnesses bleed in from other worlds. Attack of the Koblins A 5th 6th level adventure that has PCs up against forces from another world.