It was portrayed in the Dark Wanderer Epic Destiny and it's ability to reach ANYWHERE in the cosmos by walking for 24 hours. You could even WALK BACK FROM BEING DEAD! You could die and then a certain later you just... Show up!
Epic Destinies in general were pretty excellent.
It's hard to top features that begin with (effectively), "Once per day,
when you die..."
That's just flipping great.
Other Epic Destiny features include...
Bahamut's Vessel: At level 30, once per day when reduced to 0 HP, you can instead regain all HP and
transform into a Large platinum dragon. Because you literally are a fragment of Bahamut's divine essence, a safeguard against the possibility of his demise.
Legendary Sovereign: At level 24, once per day when you would make a death saving throw, you can instead regain half your HP (your Bloodied value), end any effects on you, and stand up. This feature is called
This Is Not My Fate, and the whole ED is about literally becoming the mythical hero-queen/-king founder of a dynasty that will last for centuries.
Thief of Legend: You can literally
steal your own soul from the afterlife, allowing you to just
appear at a familiar place within 24 hours of your death. Your body disappears from where it was, and all your possessions come to you. Oh, and if you drop an enemy to 0 HP, you can steal things from them like
the color of their eyes or
their memories of their kingdom. It's up to the DM exactly how that works out.
Epic Destinies did some really impressive things, both in terms of "holy crap that would kick HUGE butt" and "that has incredible narrative implications."