Spike (Wario Land series)
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Thorns are obstacles found in various environments throughout the Wario Land series. They come in various forms, inter alia as iron balls with pointy spikes, rotating thorns or electrical traps. They all have in common that they hurt Wario and haul him backwards if he touches them. Thorns cannot be destroyed by anything and thus have to be avoided.
History
Wario Land series
Thorns make an appearance in Wario Land II and are first seen in a level called Through the Thorny Maze!! in Maze Woods. Most levels that include these obstacles also feature the Owl, a helpful animal that carries Wario through the air. The thorns serve as obstacles in these passages, making navigation through the air more difficult. Thorns also reappear in Wario Land 3 where they serve the same purpose as in the previous game.
Gallery
Rotating Thorns 
Iron Thorns 
Another type of Thorns - WL2 S 5x-4.PNG
Electrical Thorns 
Thorns from Wario Land 3
