A champion whose ult turns them into a walking piece of terrain. As in, they literally become a champion's hitbox into a piece of terrain, so you could stun people on him with Vayne/Poppy and put Magical Journeys through him. Bonus if he deals AOE damage for every 200 units he walks.
Malphite rework now.
I think they looked into having Braum's Unbreakable do that but had issues with it (back when they changed all the terrain creation abilities to do that). Unfortunately I don't remember any details other than it was brought up. Not sure if I'll be able to find it.
Big question. How would you make it hugely different from 
He pulls of the terrain Wombos really well, same with 
Its a great idea! But you have to make it different and distinct enough from other champions to really get it going.
