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.

Examples
In the BIONICLE story, so far only one Nova Blast has ever been used. Toa Nuva Gali used one 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, presumably by the Rahkshi power of teleportation.

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 levels.
 * Turaga are unable to perform Nova Blasts, as they lack the power needed.
 * Toa Ignika can perform one despite not being a real Toa.
 * Makuta can perform something like a Nova Blast.
 * Vakama once considered a Nova Blast during his fight against a fire creature, but decided against it, because it would kill everything in a huge radius.
 * In Death of a Hero, Toa Mahri Jaller almost unleashed a 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 whole city.
 * Maskless Toa could perform weakened Nova Blasts.