Out of the Abyss

Out of the Abyss begins with the player characters captured by drow and taken into the Underdark, where they must escape and survive a world thrown into chaos as the demon lords of the Abyss have been summoned to the mortal realm. Designed for characters levels 1-15, it is a long-form sandbox campaign across the Underdark featuring iconic NPCs like Drizzt Do'Urden and a horror-tinged tone. Considered one of the best 5e campaigns ever published.