Major Treasure—Deity!
This was the true form of the golden giant, one that had been carefully created by one of the Brimgan Empire's Emperors in the past. Through the Minor Treasures embedded in its eye, the Major Treasure of Deity's effects had been converted to influence a living being too.
Virala was taking full advantage of that, using the situation to soak it up fully as he had begun burning everything as fuel using Internal Astral Cultivator.
As it was a Mystic Grade Nature, by consuming the influence from the Major Treasure, it was able to gradually use the Minor Treasure of Goated Moustache as fuel too.
As Virala's genetics as a Mammoth Clansman were consumed by the Empyrean Tusk in his mind space, the influence from the golden giant affected him rapidly.
A bit of Virala chapters here, since it's the prelude to the Attribute Arc.