Dragoon Dens are naturally spawning Structures introduced in the Shipwrecked DLC. They are found inside the Volcano, and spawn Dragoons. It can also be crafted using 1 Dragoon Heart, 5 Rocks and 4 Obsidian, doing so requires an Alchemy Engine to prototype. Dragoon Dens cannot be Hammered, but they can be deconstructed using explosives, such as Gunpowder or Coconade.
They can house 3 to 4 Dragoons at a time, and during the day, every 30 seconds one will leave the den; at dusk, all will return. If a Dragoon dies, it takes 2 minutes for the den to regenerate it.