I tend to use lightning on most things because it kills them quickly. Beatles, Lizard Mages, Trolls. Things that get in the way when I'm mapping out the Dark Forest and I'm a low level. If I were to fight 20 or so Lizard Mages without using lightning and then started using it would that make me more likely to get it? Or do you just get it randomly regardless of what method you use to kill something as long as you've fought several of them before?