I can't reveal too much about Viper, but I can reveal some things without spoiling the book.

Viper is the master of Illusions. He can cause you to think that you are seeing your worst fear. He can also cause you to pass out. It's kinda weird; but kinda cool! If you look closely, you can tell that he has an orange lighting symbol in both of his eyes.

That's all I can reveal about Viper. I do take requests, most of the time their Ninjago drawings. I hope you liked the chapter!