Unlike lower levels of Super Saiyan, which quickly exhaust their power the longer they stay transformed, Legendary Super Saiyans' power will continually increase at an exponential rate for as long as their transformation lasts.
In the Broly Triple Threat trilogy, Broly is the latest of saiyans who are able to attain an ascended form of Super Saiyan known as Legendary Super Saiyan, users of which are said to only appear once every 1000 years.
Broly is a recurring character from the Dragon Ball series, who makes his first debut as the main antagonist of the movie Dragon Ball Z: Broly - The Legendary Super Saiyan, but did not make his first canonical appearance until Dragon Ball Super: Broly, where he is given a different backstory and personality.
