Causing an explosion is effective and will inspire awe and fear, but anyone can do it, from the alchemist to the wizard to the goblin sapper. But those who truly understand the energies of the universe, understand that the most dreadful powers will actually pull IN. If you can grasp the concept, you can cause an implosion in space that pulls enemies toward it. You can see their horror and watch them try to escape its grasp, as their bones and flesh are crushed to an infinitesimally tiny point.