The Dragoncave is a chamber on the east side of the Underground Jungle.
The entrance is located in the extremely dense rock wall and is blocked by a large rock.
Inside the chamber is a large, egg-shaped rock structure on the ground, from which the boss Suomuhauki will spawn with an Earthquake-like visual effect (without falling debris) when approaching the center of the egg after digging out parts of it.
The Dragoncave, including the boss, also appears in Parallel Worlds.
The Dragoncave, untouched.
The egg, compared to the player.