Most episodes do not have violence in them.
Episode 9 is the episode with the largest amount of gore/violence.
A teenage girl loves to murder people.
Photos of murdered people are shown, not very graphic, blood is visible.
A girl is decapitated off-screen, we see the aftermath. There is blood clearly visible.
A girl is hit on the head with lightning bolts, blood is seen splattering onto the wall behind her.
Most of the time there is just innocent magic fighting.
Most of the time there is very little violence, but in one of the episodes a character is quite brutally killed and is seen standing over bloody corpses.