Made an idea for a siege based support and could use some help

So lore appearance and name are currently. N/A RIGHT now Since this idea was thought up with a friend today.

 His q we thought it would be cool if it empowered his weapon causing the next 3 basic attack to deal 100% of his AD to towers and bonus damage. When hitting an enemy champion it reduces their Armor by 10% and 1.5 seconds applying A 10% slow for 1.0 seconds.(each stacks up to 3 times and each hit resets cool down for both).
The W we thought it should extend his weapon and sweep from his right side to his left. Champions and minions that are caught in the sweep are moved to the left with his weapon. This may deal some damage i don't know yet  
For the e we want to do some kind of grab but don't really know how to implement it.
 His R we something that gives his allies a boost at siege if they are in a certain range when he casts it.

The idea is very basic right now any suggestions are greatly appreciated and i'm willing to edit most of this and am open to ideas.