Crosto

Crosto is an Agori who worked alongside Tahu ever since the Core War, when Tahu allowed him to find the Mask of Life to bring Spherus Magna back together. Throughout the quest, from Bara Magna to Earth, Crosto constantly warns everyone of the threat that the ancient assassin Marendar (who stole the Mask) poses - and during a final battle in Philadelphia, Marendar vaporizes Crosto.

BIONICLE: Universe
Crosto makes his During the War, he attempted to leave the battlefield area to locate safety - but was forced to help construct the Matoran Universe robot. However, a raid of Skrall warriors attacked his working area - giving him the chance to flee. As he ran through the battlefield, Takanuva and Gresh invited him to come along. As the rest of Tahu's rag-tag team formed, they headed toward a large pine tree to escape from the earthquakes and tidal waves being caused by the shattering of Spherus Magna. They began to climb it, although several Matoran and Agori fell - but Crosto successfully made it to safety.

Many years later, Crosto was still working with Tahu to find the Ignika - and they finally found it in the Arena Iconox. There, however, Makuta and his minions battled them until Marendar appeared. Crosto warned everyone of the danger that Marendar posed, and his advice was taken.

Crosto escaped the Arena and continued with the rest of the team to search for the Mask, using an Order of Mata Nui ship to travel to Philadelphia. However, their ship crashes, and they continue their search on Earth until they find the Ignika in South America - although they realize that Makuta's minions and Marendar are also on Earth. Therefore, a battle rages on in Philadelphia. There, Crosto and the other Matoran and Agori stayed out of the fighting until Tahu and Teridax faced each other off in front of the Comcast Center until suddenly, Marendar warped in-between them. Immediately, the assassin took Crosto hostage, demanding the Mask for him to live. Tahu, however, denied it, thinking that Marendar wouldn't kill Crosto - but the tables turned as Marendar vaporized Crosto with pure plasma, leaving not even a single trace of him.