Answer:
Always wax, yet always wane: I melt, succumbed to the flame. Lighting darkness, with fate unblest, I soon devolve to shapeless mess.
As beautiful as the setting sun, as delicate as the morning dew. An angel's dusting from the stars. That can turn the Earth into a frosted moon.
Which word contains 26 letters but only three syllables?
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
Sometimes black, sometimes white, I have veins but no blood
You use it between your head and your toes, the more it works the thinner it grows.