the longer reshiram (& zekrom) remains out of its orb form, the more aged it looks
the tips of its feathers and claws char over time while simultaneously growing longer
this goes on for its entire life until the hero dies, at which point it will go back to the orb, starting over
im thinking. are legendaries all inmortal? or they'll die someday? i know that yveltal needs to absorb lots of lives to keep itself alive, but imagine a really old reshiram at the verge of natural death. how long would they all live?