Destructable Terrain

What if the process to make this a reality was less of actually trying to destroy terrain. What if it was more like a magic trick to create an illusion of destroyed terrain. Simply put:

1. Ability affects a section of the terrain in an area of effect. For the example lets use the skillshot indicator of Graves's End of the Line ability as a visual aide, not that this would be Graves ability.
2. The ability creates an invisible "box" around terrain that only affects that terrain upon activation.
3. Terrain in the "box" became invisible and passable, if need be, use the "True Flight" system of utilizing a dash function to get to the other side of the "destroyed" wall.
4. Have particle effects of the wall material flying out upon being "destroyed".
5. Also have smaller models that don't count as terrain that appear within and near the vicinity of the "destroyed" terrain to show off the "rubble" which lasts while the wall is still "destroyed".
6. The "rubble" created in this manner pulls from presets based on the kind of terrain "destroyed" and has a variety of different preset patterns.
7. Have the faces of the inner parts of the terrain covered with either a texture, particle effect, shader and/or model.

https://i.imgur.com/qGzOJ34.png

Let me know what you think of this.

EDIT #1: Modified the original post slightly by adding "7)" based on what ThePikol has stated about the inner faces of the terrain.