BIONICLE Adventures 6: Maze of Shadows

Maze of Shadows is the sixth Bionicle Adventures book and came out 2004.

Story
The toa Metru, Being trapped on the island that would soon be known as Mata Nui, Explore it and find a place to host a koro (village).Vakama has vision that thier toa power will run out one day. The toa gather and make their own toa stones and hide them. Onewa finds a tunnel that will lead to Metru Nui,he thinks.They go through it,encountering a nest of Bohrok, Rahi, Mutant Rahi and the Rahi Nui. During the battle with the Rahi Nui, Nokama is poisoned and fatally wounded. While the toa argue about bring her to Metru Nui or back to the island above, Vines come out and grab the 5 toa, Leaving Nokama. The vines belonged not to a reborn Morbuzahk, But a prototype, Named Karzahni(It's color is bluish based on the game Bionicle Mask of Shadows while the Morbuzahk was presumably black and red). The Karzahni offers to heal Nokama,if they get it some energized protodermis, The substance that was mutating the Rahi. The toa Metru get some and give to the Karzahni, But it is not it's destiny to be transformed, So it is killed.

Characters
Toa Vllains
 * Vakama
 * Nuju
 * Whenua
 * Nokama
 * Matau
 * Onewa
 * Energized protodermis entity
 * Rahi Nui
 * Karzahni