Acidicus is the general of the Venomari tribe of Serpentine.
Ninjago: Masters of Spinjitzu
Acidicus and his tribe were freed from the Venomari Tomb by Pythor, and assisted him in his attempt to unite the Serpentine to unleash the Great Devourer. When the Devourer was released, Acidicus hid in the Fangpyre tomb with the rest of the Serpentine, knowing that the beast would consume everything, including the Serpentine.
Acidicus and the other Serpentine generals later gave their loyalty to Lord Garmadon, until they failed to find the Island of Darkness. Thinking that Garmadon was insane, Skales betrayed him by throwing him off the Rattlecopter.
Frank's Adventure of Ninjago
Acidicus soon found himself assisting Frank when Pythor was released from hiding in his tomb and came back to reunite the Serpentine. However, The Mandarin had earlier kidnapped Kamalia, and was holding her hostage to blackmail Frank into capturing Pythor to learn the location of the bombs that Skales hid. However, Frank made a deal with Pythor and the Serpentine to defeat The Mandarin, which Acidicus assisted.
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