Horobi's purple, dark grey and yellow-coloured default form, accessed by inserting the Sting Scorpion Progrise Key into the MetsubouJinrai ForceRiser, themed after a scorpion, diamond plate and restraints. This form is equipped with a stinger on his left arms called the Acid Analyze that allows him to generate types of poisons that not only affect living organisms but also for electronic devices and HumaGears. This form debuts in Episode 8 of Kamen Rider Zero-One.



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