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. 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. During the day, one will leave the den every 30 seconds, returning at Dusk. If a Dragoon dies, it takes 2 minutes for the den to regenerate it.