To activate the keys, the holder must shout "Oracle's Light!". Two in combination can create more powerful armor and weapons. The wielder must have a sincere desire to protect without arrogance, otherwise the keys will malfunction. The Oracle Key from Nuuma was called by Corona, using her power, to let Hunter use it without having to hold it. Mantid used two of the Oracle's keys to power himself, plunging the Inner World into darkness and preventing Hunter from using his own keys.