Brainy Vapours

A powerful sorcerer is on his way to a castle. He's on a mission to destroy everything in his path. He's brought with him many different and strange weapons to use and a specific set of spells for deadly booby traps. As an omni presence, I get to watch him closely, see which spells and weapons he brings with him, which he favours. I learn that he is in the castle to destroy a child. I watch as he enters the castle, discovering all the traps that were laid for him - without harm. I know his weaknesses but I am powerless to stop him.