User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-1758220-20110914204006/@comment-1758220-20110914205629

The only biologically immortal creature I'm aware of is a type of jellyfish that reverts to its polyp stage once it has reached maturity. Perhaps Fatalis is capable of something similar. Although, comparing the biological functions of a cniderian to those of a reptile is probably pretty difficult.