If we are talking in the sense of the game, as in which is the most threatening, then stormcaller. But which one would be the scariest to go up against out of the game's context? I'd be most afraid of a bladedancer. A crazy guy with a knife? Nope. Oh, he is also electrified? That's scary. He can also move very fast and can lunge really far with his knife? Now this sounds like it's from a horror movie. Wait, you're also telling me he can go [i]invisible[/i]? Yeah, I'm a little spooked.