Roshar

"Taking the Dawnshard, known to bind any creature voidish or mortal, he crawled up the steps crafted for Heralds, ten strides tall apiece, toward the grand temple above."

- From The Poem of Ista. I have found no modern explanation of what these "Dawnshards" are. They seem ignored by scholars, though talk of them was obviously prevalent among those recording the early mythologies.