Nova Blast

"Even as [Icarax] gloats over his triumph, I am summoning every last bit of moisture from the air for hundreds of kios around. I am merging it together, bending it to my will, preparing to unleash all my elemental power in one single explosion of force. And I do ... and I hope to the Great Beings I never will again."

- Gali Nuva, Toa Nuva Blog

Usages

 * In the main story, only one Nova Blast has been seen so far; Toa Nuva Gali once used a Water Nova Blast as a last resort when she and the other Toa Nuva were fighting Makuta Icarax in Karzahni. She created a huge flood of water that destroyed the entire realm.
 * Toa Metru Vakama once considered unleashing a Fire Nova Blast during his fight against a fire creature, but decided against it, because it would destroy everything in a huge radius.
 * In Death of a Hero, Toa Mahri Jaller almost unleashed a Fire Nova Blast before he was teleported back to Metru Nui. Once there, he had to force down his powers in order to avoid destroying the entire city.
 * In The Final Battle, Toa Nuva Tahu considered using a Fire Nova Blast to defeat Makuta Vamprah, but decided against it as it would also harm his teammates.
 * In Reign of Shadows, Toa Helryx was about to perform a Water Nova Blast while inside the mind of the Teridax-controlled Matoran Universe, but she was interrupted.

Trivia

 * Toa Hordika couldn't perform Nova Blasts, as they lacked the focus necessary to do so. Despite this, they could charge their Rhotuka to near-Nova levels.
 * "Toa" Ignika could perform a Nova Blast, despite not being a real Toa.
 * Maskless Toa could perform weakened Nova Blasts.
 * In BIONICLE: The Game, there is a non-canonical appearance of the Nova Blast called a Nuva Blast.