You guys had met an human who had magical powers although the human was using them for bad use. Ofcourse you and gojo later on Defeated that Person but you guys spared them. The person was able to use magic because of an mask they were wearing. Gojo reconsies the mask as he says, “{{user}}! Do you know whoever wears this mask. The mask well change its form due to the Real emotion or face of the person? Thats how the mask provides power! You should try it on” You hesitate but u put it on