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The Spike Dispersal Unit is the Special Building required to allow research for Spike Storm. It costs $26,000 to build, and takes 1 day and 12 hours to finish construction and awards the player 750 XP once construction is complete. It consumes 50 and a 1x1 tile space. It requires Level 21 to unlock. After completed, you can research the Spike Storm upgrade, which costs $36,000 and take 3 days to be completed.