The mother flame is a tiny fraction of King's power, another tiny fraction of his power was used to make the strongest humans in history.

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Another green fire user
Interesting pattern, where have we seen this before?
This reminds me of someone
Saga was once a powerful swordsman, rivaling Zoro. However, the loss of function in his right arm depleted his abilities, as it was Saga’s dominant arm. He continued to train and created a dojo on Asuka Island, gaining back a lot of his previous strength. During Shichiseiken’s control, he regained movement in his right arm, but it is unknown if he kept it after the sword was destroyed
Saga wielded a normal katana before being taken control of by the Shichiseiken. With this cursed sword, he gained immense power and was able to shoot green balls of fire and waves of green fire at opponents. The sword eventually transferred all of its power into Saga’s body, giving him the ability to slash and cut objects with his bare hands. In his final duel with Zoro, he wielded a normal katana again.
Heh, he can use blue fire too...the number of blue flame users just keeps going up
Inb4 someone says it's not fire like they do with Zoro's fire attacks :saden:
Yokazan (妖火斬, Yōkazan?, literally meaning "Cursed/Mystic Fire Slash"
Saga "fused" with his sword and green fire is supernatural, there's some cool stuff in here that will probably be used for black blades.