Elf — The Ticking Clock
Elves past the age of 10 or so know the exact date and time of their natural death as a mental countdown. They can still be killed before this time by violence or other means. Elves are immune to all aging effects and all negative effects of aging (except death).
Elves gain a +2 untyped bonus to saves or checks to avoid or mitigate any fatal effects, including traps that would deal enough damage to kill them. The saving throw bonus only applies to deterministic effects, such as a collapsing bridge; it does not aid in resisting spells or attacks.
The Ticking Clock