As the seven billionth person born on Earth, Tier's birth was prophecized to set off the Hell-On-Earth War. It came to a conclusion when Guido killed him in X-Factor #256.
As an Asgardian entity, Tier's state after death remains ambiguous. In War of the Realms: Uncanny X-Men #2, it seemed he resided in Hel with his father, Hrimhari. In New Mutants (4th series), however, reports confirmed that Cerebro was still making updated back-ups for him on Krakoa, suggesting he was still alive somewhere.