Barrowmaze is a large megadungeon made in recent times, ive got 4 out of a 6 player group for it, older style ruleset. Theres not alot i can tell you about story or setting outside of it takes place in the Dutchy of Aerik, in the world of Greyhawk, and that the undead are rising from their barrows and are smarter and stronger than normal undead, more resistant to turning. The barrows are from an older culture and the campaign revolves around meeting npcs, exploring a hex crawl, and exploring an old style traditional dungeon with some twists on design, making it a full sandbox experience. 7pm mondays, eastern time
