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Hephaestus remembered the time when the Ragnarök unfolded, he and his family destroyed many Gods with the help of their allies, subordinates of other allied Supreme Gods.
Aside from having defeated Gaia, Hephaestus and his family had also defeated the powerful Great Titan God of Fire and the Sun, Helios.
The battle was just as arduous as against Gaia, but in the end, they came on top, and with the help of many other Gods, Helios soul was divided into pieces and distributed evenly amongst all those who helped.
Hephaestus, later on, decided to buy the fragments from his family, who didn't have much use for it as they didn't have a Fire Attribute Affinity, unlike him.
Hephaestus discovered something that not many Gods had achieved before, the ability to use the soul fragments of other gods to strengthen his own soul.