While investigating a break in at an archaeological exhibit Emerald Knight was caught unprepared when one of the relics being studied there suddenly flew and attached to her face. Emerald Knight tried with all her will power to try and resist the sudden overwhelming personality and magic seeping from the mask. Falling to her Knees all she could do was witness her costume start to shift in design as her bodies new host Callista began to take root in her mind.

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A nice piece I got from  Aokizu showing what happens when one runs across Callista the Cursed Mask