After the Toa banished Makuta to the Shadow Realm, he regained his original Mask of Control, but the Mask of Ultimate Power was trapped between dimensions.
His hate and shadow essence gained immense strength, and thus he managed to create a new body for himself out of pure shadow, inspired by the legend of “Teridax”, the Okotoan God of Shadows.
He now possesses a bigger shadow version of his hammer from the Mask Maker times and the ability to unleash a “beast form” that allows him to fly and summon shadow rays from his body.
Makuta waits for the moment a portal to Okoto would open so that he could gain the Mask of Ultimate Power, destroy his brother Ekimu and the Toa, and unleash an Era of darkness on the World.
The main 2 guys for inspiration were G1 movie teridax and TF: Prime Megatron.
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