An oasis exploration and lava-filled obsidian dungeon crawl for 4-5 players of 5th to 6th level. Battle elemental evils, save captured sandworms, claim unique elemental magic items. A malevolent and ancient elemental lies imprisoned within a lava-filled obsidian cavern. Explore the hidden passages before his shackles break and havoc is unleashed upon the nearby oasis! 10 pages of oasis exploration and lava-filled dungeon peril! Statblocks for the life-cycle of desert sandworms, plus three unique elemental magic items like "Summer's Bane" - an armlet of compacted ice that grants the wielder a magical bow, and the "Embershard" - a dagger made from the jawbone of a red dragon that imbues the wielder with elemental magics. Run the adventure your way - drop the PCs off at the dungeon entrance and explore the perlious cavern, or let them cavort in the oasis before uncovering the lingering threat. We hope you enjoy the desert oasis and obsidian-carved dungeon crawl from the Heart of Arcana.