Braum buff's suggestion.

Nothing too much crazy.

Passive: Concussive Blows. Maybe buff the damage per level.

Q: Winters bite. slowing them by 70%, decaying over the next 2 seconds. >>> slowing them by 50% for 1.5 seconds.

W: Stand Behind Me No changes there.

E: Unbreakable Braum takes no damage from the first projectile he intercepts >>> Braum takes no damage from three projectile attacks he intercepts.

R: Glacial Fissure For the next 4 seconds a field of ice remains, slowing enemies that enter the area by 40 / 50 / 60% for 0.25 seconds. >>> 0.5 seconds.

Edit: he is like one of the weak supports right now sitting at 47.43% win ratio.