The Bloodsoaked Gem Caverns in action

Vance A from Leicester's Ramble ran my dungeon, Bloadsoaked Gem Caverns. You can read the actual play report here! 

They used Shadowdark. The PCs definitely lucked out on the Reaction rolls!

The dungeon can be found here. It's an abandoned mine (overtaken by monsters) that the party can explore and even start exploiting.