This is an art dedicated to Blizzard's biggest official authorized fansite in China - Cain's Corner [link]
This is a fanart featuring 2 main characters in Diablo 3: Deckard Cain and his niece, Leah.
They had journeyed together to search for truth. It's said that the prophecy of the end of the world speaks the only way to avert the end of all things. They came across an ancient library that buried under a ruin - once a glorious city but destroyed by the evils. Although Leah wasn't fond of the so-called "necessary action" to save the world. She just couldn't leave her uncle behind since he's only family she had. So instead, she helped him on his quest, searching scrolls after scrolls, books after books.
Hope is waiting for them!