Nova Blast

A Nova Blast is when a Toa exerts all of their Elemental Energy at once, releasing an extremely powerful explosion of that Element. Once a Toa has done one of these, they cannot use Elemental powers until their Elemental Energy has recharged. They were not so often used because of their destructive and usually deadly force.

Known Uses
Toa Nuva Gali used a Water Nova Blast as a last resort when fighting the Makuta Icarax in Karzahni. She summoned a huge flood of water that destroyed the entire realm using all of her power. Unfortunately, Icarax escaped.

Makuta
Makuta could perform something similar to a Nova Blast. Makuta Mutran did this in BIONICLE Legends 9: Shadows in the Sky when he gathered all his shadow energy and unleashed it all in a massive explosion.

Trivia

 * Toa Hordika cannot perform Nova Blasts as they lacked the focus necessary. Although it has been hinted that they could charge their Rhotuka to near-Nova Blast levels.
 * Turaga are unable to perform Nova Blasts, as they lack the power needed.
 * Toa Ignika can preform one despite not being a real Toa.