North King Kai's actual combat strength was not particularly great, but perhaps because he had lived long enough, the two ultimate techniques he developed were exceptionally powerful.
The first was the King Kai Fist. As long as one's body was strong enough and one's control over ki was sufficiently refined, one could condense ki for a short time and increase one's combat power by dozens or even hundreds of times. It was absolutely a divine technique for short-term bursts of power.
Jerry was an Earthling and did not have the Saiyans' ability to transform into Super Saiyan One, Two, or Three at will.
However, his physical body would grow ever stronger under the cleansing of magic. With the King Kai Fist, he could fully rival a transformation.
If tenfold was not enough, then a hundredfold. If a hundredfold was not enough, then a thousandfold. If a thousandfold was not enough, then ten thousandfold. As long as his body could endure it, he could keep multiplying his strength.
The second was the Spirit Bomb. It gathered a small portion of the life energy given by mountains, land, and all living creatures, then unleashed an explosive strike that surpassed one's limits. Its power mainly depended on how much life energy was collected.
Someone like Jerry's true body, which had already advanced to the multiversal level and possessed two universes, could instantly absorb the life energy from both universes and create a Spirit Bomb with unbelievably devastating power.
Even if he encountered Dimension Demon Gods of the same level, they would probably have to kneel and call him Daddy after taking a Spirit Bomb like that.
Once he split off more universes later on, the power of this move would continue to increase.
Its weakness, however, was that it was only effective against