The Mask of Ultimate Power, also known as the Forbidden Mask is the dangerous mask which was forged by tha Makuta the Mask Hoarder and was one of the legendary Masks of Power of the planet of Okoto.
The Mask of Ultimate Power was first created by Makuta when he became jealous of his brother Ekimu's masks gaining more praise than his. He then immediately defied the sacred law of the Mask-Makers as he began to outdo his brother by forging the Mask of Ultimate Power, the mask that contains more than one element.
It takes some weeks for Makuta to finish forging the Mask of Ultimate Power before he put on the mask onto his face and he decides to earn the praise from the Islanders and Okotonians as he provided them with power that could aid them in their daily lives. However after some weeks later, the Mask of Ultimate Power was proved to be very dangerous as it began to corrupt Makuta's mind and transformed him into a dark being. As the result, the power of the mask began ravanging Okoto.
When Ekimu learned about this, he confronted his brother and successfully knocked the mask off from his brother's face. However, both Ekimu and Makuta were rendered into coma as the result.
Later, the Elemental Creatures were tasked by Narmoto, the Protector of Fire to scattered the three masks: the Mask of Creation, the Mask of Control and the Mask of Ultimate Power throughout the region. As the result, the masks were waited hidden for someone to retrieve them.
So far, the Mask of Creation was retrieved back by Ekimu, who have woken up from his coma thanks to the efforts of the Toa Mata and the Mask of Control was currently located inside the Labyrinth of Control in the heart of the volcano. The Mask of Ultimate Power was currently in the possession of Makuta as he was seen rallying the Skull Army to prepare to attack Ekimu and the Islanders.
Later, it was revealed that the Mask of Ultimate Power
- Makuta the Mask Hoarder (Formerly)
- Makuta Teridax (Formerly)