Lerrua

Lerrua was an Avata Ul that was exposed to neodermis, making him an intelligent and fully sentient Avata-Kal. It was after this that he and one other that shared his fate were transplanted into Rahvshi (and Rahkshi respectively) and sent after the Toa Mata. As an Avata Ul, Lerrua was placed in a Guurahv shell, which was later augmented into a Guurahv-Kal shell. He was then sent to the Shattering Universe by the Makuta Teridax of his own universe to aid the Toa Mata.

Shortly after the Shattering, Makuta Teridax was defeated by Taka Nuva, Lerrua used Makuta's energized protodermis pool to fuse his Mask of Kindred, Mask of Emulation, and Mask of Conjuration together to form the Kanohi Takal, The Mask of Mastery. He then fused the mask to his Rahvshi before submerging himself and his Rahvshi in his hidden vat of neodermis to synergize the powers of the masks. In doing so, he became Valari Lerrua.

Meanwhile, Dakra seized the Mask of Shadows and the Staff of Shadows from the fallen Teridax and merged it with his Rahkshi using the protodermis, becoming Makuta Dakra. He then created a counterfeit Mask of Shadows infused with the power of 3 Staffs of Darkness augmented by antidermis and laid the mask by the crushed body of Teridax.

Afterwards, Makuta Dakra assumed control over the Kraata and their Rahkshi, hiding them away deep beneath the surface of various islands.

Stats
Lerrua is an intelligent and calculating combatant, taking the time to analyze his opponents strengths and weaknesses while tapping into their powers to level the playing field against stronger opponents.

His ability to adapt to any situation makes him both a formidable foe and a reliable ally.