


The limits of the multiplier appear to be linked to the user's body toughness in addition to experience, so Goku is able to increase his durability and base strength through training and in turn gain an even higher power multiplier from the Kaio-ken. Whilst already a useful technique in its base form, the technique's true potential is in its ability for the power multiplier to be stacked, from doubling of the base Kaio-ken to a tripling, quadrupling and even further. Even one friendly slap on the back from a gracious Yajirobe caused Goku to scream out in agony. After using the Kaio-ken x4 to overpower Vegeta's Galick Gun, Goku's entire body was thrashed, and he could barely move without hurting himself. The uprise of ki flowing inside could easily obliterate them, and even when kept under proper control still causes intense muscle spasms, pain and weakness after prolonged use. This short burst of power beyond the body's normal maximum output comes at the cost of increasing the flow of Ki within the user's body, taxing it and requiring great skill and concentration to keep under control. This change is quantified as doubling the user's power level for the base Kaio-ken technique. With training, the length of activation can be increased, as shown during Goku's extended use of the technique against Frieza eventually during the fight with Hit, Goku manages to hold a casual conversation with the technique active, and uses it continuously during their next engagement. The technique can also generate large amounts of heat from the user's body whilst being activated, creating steam rising from their body.Īs a result of the Kaio-ken, the user's base power level, strength, speed, and even sensory awareness greatly increase for an instant. There is no change to the user's physique, but the enormous stress of the technique can result in increased blood pressure, popping out veins and swelling the user's muscle mass. Unlike other transformations (like the Super Saiyan or Golden Frieza), the Kaio-ken must remain with its aura active all the time. The power of the aura also bristles the user's hair and clothes if they have any. When activating the Kaio-ken, the user gains a red and fiery aura, and in turn, their whole body and clothes acquire a reddish tint.
