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In the Subspace Emissary, certain levels with water include a hazard unofficially called a thorn helix that bursts out of the water at certain times. These appear as thorned spirals of vine, and will often destroy some of the terrain and deal slash damage to a player if they are touched. However, they are not enemies, and cannot be destroyed. Because of this, it is unknown whether they serve the Subspace Army or are just a natural part of the area. They are similar to the skewers on 3D Land and one of Ridley's attacks in Pyrosphere.