In the Nandimitravadana translated by Xuanzang it is said that the Buddha's relics will be brought to parinirvana by Sixteen Great Arhats and enshrined in a great stupa. That stupa will then be worshipped until it sinks into the earth down to the golden wheel underlying the universe. The relics are not destroyed by fire in this version but placed in a final reliquary deep within the earth, perhaps to appear again.