I see what you mean, and that's definitely possible with this hero. I envisioned the E ability working like Sgt. Hammer's Siege Mode, where it lasts for any amount of time and it changes the play-style of the hero. While I like your idea, I would need to make the trait have and active role, pressing D would change weapons and E would be the buff you described. That would work with the change to the trait you describe below, but I like to keep the jumping over walls part of the hero, it...

Honestly, used google for all but the trait icons, those are straight from the game. The icon for the reaper itself is someone's really good art. You can right click to see each image and its source. Glad you enjoyed the concept.