User blog comment:Emptylord/Custom Champion - Clockblocker/@comment-7709681-20150526190407/@comment-3974211-20150527001957

Shrapnel Field's specifics was in deed based on Ziggs' Minefield in an attempt to remove the anti-pattern of "punishing moving". It previously dealt periodic damage; it previously dealt increased damage to targets who dashed/knocked into; etc, but these all seems to treading dangerously close to a territory League doesn't want. Having multiple "traps" scattered around that enemies can walk into seemed like a fair middle ground.
 * Shrapnel Field

The specific number of shrapnel was simply for symmetry - but I suppose it's not necessary for the ability to be a circle. It was intended to be more of a cone/semi-circle - it's not a targeted ability. It lasts much less time than Minefield, and is more of a mildly persistent Incinerate.

The ability was based entirely on one of the character's iconic tricks - turning clothes and sheets of paper into indestructable shields. I suppose I'm going for a more mobile Braum - his effects are shorter lived but up more frequently, so it's more about timing than denial.
 * Immovable Object

I... honestly wasn't sold on the ultimate myself. The kit was created as just an innate, Q, W and E. However, the R seemed to fill the void in his kit that was mobility - except in an entirely offensive way. It was envisioned to be a pseudo-Blade Waltz, for applying his innate to multiple targets - allowing him to disable high profile targets as well as reposition for his point-blank Q and E abilities (since he lacks reach in virtually his entire kit).
 * Mover 5

He's all about creating windows for his allies to set-up fights, through his innate and Immovable Object - which is literally the definition of a support.

"From laning to late game teamfights, supports create advantages and opportunities for their teammates to capitalize on."

- Riot's official definition of Support.