Ability concept: Terrain Destroyer

Hello it just occurred to me a idea of a really cool ability that is completely unique and never been done before at all. Anyways here goes, and some ideas on making it balanced(as it is pretty op)

Ability description- Version 1. Ability temporarily destroys a small area in terrain for 3-5 seconds, that allows all units to walk through. Version 2. Ability builds a small bridge that allows any unit to cross the terrain on for 3-5 seconds. This ability would allow you to walk over any terrain while it lasts. Once it ends if you are still inside the terrain, it would work like a blink into terrain(you come out the closest side) This ability would allow you to walk over the wall into baron, dragon, anywhere in the jungle, anivia wall, jarv ult, trundle pillar etc. This ability would not be wider than a turret.

If it were the bridge making version, perhaps it would create a wall from where it extends on the outside, and you can walk in the middle of it(essentially think 2 parallel anivia walls that allow movement across terrain inside) Also this bridge making version could allow one to trap the enemy similar to jarv ult, by haveing the entrance and exit of the bridge be terrain.

This ability would be best suited on a jungler or a support. It would ideally have a long cd(15-20 seconds, perhaps at max cdr) and would not have a very long duration(3-5 seconds) to allow it to not completely render abilities such as anivia wall, or jarv ult ineffective.

If it were a terrain destroying ability then it could be a bit shorter cd, as it can serve as a double edged sword(more so than the bridge)

Anyways I presented my thoughts on this ability. Now it is your turn to imagine what other abilities, and what kind of champion would have a ability such as this. Also give your thoughts on how a ability such as this would look like. If you were in charge of making this ability a reality what would you change, or add or remove?