Chen Sansi experienced it firsthand.
The process of melting fire feels more like a devouring than a fusion, akin to a big fish eating a small fish.
Given that the Burning Sky Fire is superior to the Ten Thousand Beast Fierce Fire in both rarity and overall power, it thus devours the latter.
Additionally, within Chen Sansi's body, there are the Yin Soul Netherworld Fire and the Taiyin Qinghua Life and Death Flame.
He once again formed a hand seal to cast spells, attempting to fuse these two types of flames as well, a process that went relatively smoothly.
The Yin Soul Netherworld Fire within the mere second-tier magic artifact naturally couldn't compare to the Taiyin Qinghua Life and Death Flame, thus it was devoured by the latter.
After the devouring, the name of Taiyin Qinghua Life and Death Flame did not change but split into "Life" and "Death" flames, controlled at will, with Life Flame for healing and Death Flame for enemy slaying.
