Spoiler alert for WOT: My question is, what would happen if Nightblood were to begin drinking in the True Power? The Dark One is literally evil itself. Unlike the One Power, the True Power is inherently a very corrupting force. Nightblood is a sentient being, I can't imagine he can come into contact with that much pure evil and have no adverse side effects.
Plus its worth remembering that not even the Dark One could stop the flow of True Power into Callandor. I can only imagine what would happen if Nightblood begins to drink of evil itself.
