i noticed that shock is one of the most popular element of sk because it can keep shocking an enemy even after initially stunned from the first shock.
so far what the other damage element like fire and ice aren't so popular.
fire: causes periodic damage to the victim. ( directly from wiki)
Freeze: will cause the victim to become frozen in place. ( from wiki)
shock: at random intervals, cause the victim to spasm, interrupting anything the victim was doing and damaging them. ( from wiki.)