Menax Sei

After being struck by what was later found out to be a beam of Protodermis, the Toa-Tera were transformed into stronger, faster, better, more powerful versions of themselves. They became the Toa-Sei, in a tunnel between the Island of Desei and Tera-Nui.

Menax Sei
After being struck by the Protodermis beam, Toa Menax became Menax Sei. He now has Chest armor, A Fire-Staff, new shoulderpads, and is more powerful.

Desei
After arriving at Desei, after being turned into the Toa-Sei, the Toa split up. Jatax took Telrak and Vessen through the Desert land, while Menax led Gerjak, Yaltraz, and Zalt through the Forest land. They met up at the center of the island, to find a cave entrance, guarded by Mutan and Samurai, two experiments made by Makuta Gelrax. The Toa were split up during the fight, and Menax, Vessen, Yaltraz, and Gerjak fought against Samurai, but were defeated. Later, the Toa all teamed up against Samurai, and defeated him.