I'd be Judge Ghis. (SPOILER)When he got the Dusk Shard from Ashe and tested it in his ship, he said something like "The power of nethicite in my hands. It takes more than blood to make an emperor, Vayne." Well, something like that. In other words, he'd totally betray Vayne and use the stones to take over everything, which is exactly what I'd do because I'm secretly a moldy jackass.