Eyes of the Stone Thief is a mid-level adventure for 13th Age which involves a living mega-dungeon which hunts the PCs. It's tag line is "Can you kill the dungeon before it kills you?" It's a big, 360-page hardcover. Publisher Pelgrane Press has converted two sections from the campaign to 5th Edition, which you can pick up free if you've got Eyes of the Stone Thief, or which you can purchase at their web store or DTRPG.
13th Age is - rightly - known for it's interesting monster design, and it's excellent ENnie-nominated Bestiary, which includes lore, variations, related rules, lairs, environments, plot hooks, and more. You can see their take on the standard Orc here. As you can see, their approach to monsters is a little different to 5th Edition's.
This 39-page 5E conversion contains The Maw and The Gauntlet, two sections of this vast living dungeon. If you're a 5E fan, but are curious about how other "D&D-based" variations approach things, this is a good way to dip a toe in and take a look.
Talking of 13th Age, you can grab the PDFs from the Bundle of Holding right now at a knock-down price. There's the 13th Age Core Set ($19.95 gets you the 325-page 13th Age rulebook, the 13 True Ways rules expansion, and the 13th Age Soundtrack), and there's the 13th Age Adventures ($14.95 gets you The Book of Demons, The Book of Ages, and the newest collection of magical treasures, Loot Harder). And if you pay a little more, you get a whole ton more stuff. And 10% goes to charity!
13th Age is - rightly - known for it's interesting monster design, and it's excellent ENnie-nominated Bestiary, which includes lore, variations, related rules, lairs, environments, plot hooks, and more. You can see their take on the standard Orc here. As you can see, their approach to monsters is a little different to 5th Edition's.
This 39-page 5E conversion contains The Maw and The Gauntlet, two sections of this vast living dungeon. If you're a 5E fan, but are curious about how other "D&D-based" variations approach things, this is a good way to dip a toe in and take a look.