When the Brahma Flower Jade Blood Snake reached World Emperor/Divine Kingdom, its bloodline had already transformed into the Ancestral Contract Brahma Snake.
The Ancestral Contract Brahma Snake's prowess was evident from its name, primarily governing other snake-species feys.
The new World Emperor ability, Soul Box of the Ancestral Snake, had a powerful life-saving capability.
By expending its soul energy, the Ancestral Contract Brahma Snake could craft a soul box. Subsequently, it risked soul injury to divide a portion of its soul, placing it within the soul box, which could be stored anywhere.
Upon the snake's death, the split soul within the box would activate, regenerating into a new Ancestral Contract Brahma Snake from within the soul box. The newborn snake retained its original abilities but operated at diminished energy levels until fully recharged.