After undergoing the "Pilgrimage" process required to meet with the Tenth Abyss, Yi Chen's "Three Kneels and Nine Proestrations" made the memories related to the Death God Statue become clear.
The reason why Yi Chen was able to transcend worlds, and why he carried the black liquid symbolizing death into rebirth in this world, is directly related to that divine statue associated with Death.
Today, the War Relic that Jin had found also emitted a faint divine essence. Although the divine essence emanating from the surface of the broken sword did not match the divine statue Yi Chen kneeled before in the dark room of the orphanage, and might even belong to two different theological factions, both likely originated from the same world or a greater world.
The revelation of this sword also sparked great interest in William regarding "War Relics,"