"Heavy is the Crown" is a Pathfinder adventure for four 8th-level characters, concluding the Sky King's Tomb Adventure Path, a three-part monthly campaign in which a group of adventurers travel deep underground to discover a legendary dwarven king's tomb, seek subterranean treasures, and heal millennia-old injustices -- all while stopping an ambitious villain from weaponizing those same discoveries. This adventure also includes exciting ways to continue the campaign, an overview of the subterranean Darklands, a gazetteer of a lost dwarven homeland, and fearsome creatures that prowl the darkest caves.