Deadly terrain, any champions without flying that occupies chasm will die instantly. Large champion can occupy up to 2 chasm spaces without dying.
Notes: champion can't be blinked if it occupies Chasm.
Champions can be forced to step into a cliff by means of some abilities and spells. The most used effect to provoke chasm kills is Knockback, note that if the champion being pushed to the chasm has AP left, he will lose it the first time it's pushed, and will stay on the edge of the chasm.