kaioken
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Kaio-ken is a technique used by Goku and other characters in the Dragon Ball series. It allows the user to multiply their power level for a short period of time, giving them a temporary boost in strength, speed, and agility. However, using Kaio-ken puts a significant strain on the user's body and can be dangerous if overused. It is a powerful technique that is typically reserved for extreme situations when all other options have been exhausted.