BIONICLE Legends 4: Legacy of Evil

Legacy of Evil is the fourth Bionicle Legends book and came out 2006

Story
As the Piraka begin to head down the stairway to the Kanohi Ignika Mask of Life, Zaktan begins remembering the time he and the others spent in the Dark Hunters...

Vezok and Hakann raid a Toa Fortress for a treasure rumored to be inside (or, more accurately, Vezok raids it while Hakann is left to fight off the guards). Vezok finds that the treasure is a tablet called the Makoki stone, and that the tablet is covered with hidden writing concerning the Brotherhood of Makuta. Vezok takes the stone, but the two thieves are caught and forcibly recruited into the Dark Hunters (joining the other four future Piraka), who take the Makoki stone for themselves.

Zaktan leads the others (minus Avak) in a plot to overthrow The Shadowed One, but they are caught. When The Shadowed One tries to execute Zaktan with his Disintegration Vision, Zaktan surprises everyone (including himself) by surviving as a mass of Protodites.

Reidak, Vezok, and Avak free the Kanohi Dragon from its icy prison, letting it loose on Metru Nui. They then go to Turaga Dume offering the Hunter's "protection". Dume refuses, but just as Vezok tries to kill him, Toa Lhikan, Toa Nidhiki, and the rest of their team intervene. The Hunters leave to try again later, while the Toa fight off the Kanohi Dragon. The Toa finally defeat the dragon after a month, and have it deported to Roodaka's homeland.

In the war between the Toa and the Dark Hunters, Hakann watches Nidhiki betray the Toa and he catches Lhikan overhearing the betrayal. In an attempt to ensure his own freedom, Hakann offers a deal: Lhikan could have the Makoki stone back if he allows the defeated Hunters to go free. Knowing that his fellow Toa gave their lives to protect the stone, he agrees - with the condition that the Hunters take Nidhiki with them. Six months later, The Shadowed One has the stone stolen back, split into six, and auctioned off to the Brotherhood of Makuta, he also has Roodaka mutate Nidhiki, dooming him to a lifetime with the Hunters.

Zaktan, Thok, and Reidak are protecting a base in the war against the Brotherhood. After Roodaka tips them off that the base used to belong to the Brotherhood of Makuta, Zaktan investigates and discovers an entire record of the Great Cataclysm. After getting over the shock of the depth and evil of the Brotherhood's plans, Zaktan vows to make himself become part of them.

The six, sick of their servitude to The Shadowed One, abandon the Dark Hunters and take the name Piraka. They go to Mangaia, investigating rumors of Makuta's death, where they find his empty armor. In raiding the lair, Hakann finds a Spear of Fusion and accidentally fires it at Vezok, who splits into two. The second being takes the name Vezon and claims the spear before the entire group suddenly gets the same thought in their heads: a Mask of Life exists, on the island of Voya Nui, and it has to be found. Unfortunately, the group gets attacked by Mana Ko guardians, while Vezon slips away unnoticed, the rest escape to the island of Mata Nui and discover Toa canisters. They decide not only to use the canisters to get to Voya Nui, but to pretend to be Toa once they get there.

Back in the present, Hakann goes ahead of the rest down the stairs. The others find him cowering with fear, burning so hot that his armor is melting off his body, with somethings footsteps coming up towards them...

Characters

 * Piraka
 * Vezon
 * Lhikan's Team
 * Toa of the Green