In the book Elantris by Brandon Sanderson, there are inhabitants of the city of Elantris who are demi-gods: very long lived, and regenerate almost instantly from wounds so pretty hard to kill. But a curse befalls the city and the inhabitants go from regenerating wounds to not being able to heal at all. The pain from the initial moment of a stubbed toe persists with you... forever or until the curse is lifted.

In one part of the book and it has been I think 20 years of the curse, some characters are considering how to relieve themselves of the pain. If the body was cremated, would that end it or would the pain of being created persist with whatever is left?

Your comment about the sun freeing the immortal from suffering made me think of this. What if the immortal isn't freed from suffering by being engulfed by the sun?

Uncountable infinite then.