Nova Blast

A Nova Blast was a powerful elemental manuever that any Toa was capable of. It was achieved by focusing all of a Toa's elemental energy into one blast, and could be, in theory, done with any element. They were not so often used because of their destructive and usually deadly force.

Known Uses of the Nova Blast
In the BIONICLE story, so far only one Nova Blast has 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.

Toa Metru Vakama had once considered a Nova Blast during his fight against a creature made entirely of fire, but decided against it, because it would kill everything in a huge radius.