Thinking about my game world and what should happen in it in the not so close future, I came to a simple decision: WAR. This is an article on the topic of war.
Traps need to make sense. Somebody must of made it for a specific purpose.
A powerful wizard that the PCs encounter is completely silent. He does not speak and cannot be heard as he moves. Even his spells are silent, but his magic is just as potent.
He has a tendency to summon invisible chairs, place foes in invisible boxes of force, and other "mime tricks".