The Whispering King knows everything there is to know about Nothing. Not our nothing but the nameless nothing, the sub-nothing. The thing that nothing doesn't even know. Sometimes he may give hints to inspire lucky artists, kings or court jesters, purely for his own amusement, but whatever he says, by it's very nature, remains forever unrepeatable.
I was told he can be caught by using a flame in a bottle as bait. I think trying to catch or control him is a silly idea.