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'''Forbidden Ability Cards''' are [[Ability Card]]s that are considered evil and wrong, very similar to the [[Doom Card]]. Spectra used the Forbidden Ability Cards to force [[Drago (Dan Kuso)|Drago]] to access the power of the [[Perfect Core]] so that he could use all six [[Attribute]]s.

This card's effects trigger a forced evolution on any [[Bakugan]] it is used on. [[Gus]] and [[Spectra]] wanted to used it to create an army of super-powerful Bakugan. So far, it has only been used on the Bakugan that the [[Vexos]] threw out ([[Mega Brontes]] and [[Elico]]) along with Gus' own [[Premo Vulcan]], turning them into [[Alto Brontes]], [[Blast Elico]] and [[Rex Vulcan]], although Alto Brontes has been since thrown away. Spectra mentioned it when he had [[Drago (Dan Kuso)|Drago]] and with [[Helios]].