Champion Concept (Praetorian, The Wayward Legionnaire)

So the Mount Targon revamp made me start thinking of new champions that might be associated with it. I started out thinking about a top laner, but ended up with a support I think. Me being a support main has nothing to do with it I'm sure. Let me know what you think and I apologize ahead of time for any mistakes or if this frankly pretty generic idea has been posted ad nauseam, its my first post.

Passive - Discipline Gains bonus health regeneration and attack speed for each nearby ally.

Q - Pilum: Skillshot(Similar to Cocoon in size and range) Damages and Slows target. If the target has a shield active it will "pop" the shield and the damage and slow become AoE.

W - Repellere Gains attack speed and small knock back on autos for a short time, similar to Graves but also affects champions.

E - Aquila: Banner(Selection similar to Pick A Card) Places a banner that provides % base health and base mana regeneration.(Shield symbol on banner.) or Places a banner that provides bonus movement speed and tenacity.(Sandal symbol on banner.) or Places a banner that provides attack speed and cool down reduction.(Gladius symbol on banner.)

R - Cuneum: Skillshot(Similar to Braum ult in size and range) Charges forward damaging and knocking back any enemies in his path, at the end of his charge gains movement speed and % damage reduction(lower than Alistars, maybe lower than Urgot too)

Might need to replace the mana regen on the banner with armor and/or MR since Riot has started using mana gating to control champions more, but let me know if you have any suggestions.