Aatrox ultimate fear idea, dive fighter feel

I know people have thrown around putting a fear on Aatrox's ult, which I love that idea. Very thematic to the embodiment of war itself. Anyway, Aatrox is a "dive fighter."

Much like we have tanks (more cc, less damage) and juggernauts (less cc, more damage), we have dive fighters (decent CC and decent damage). Dive fighters jump into a fray and do something big, usually trying to CC multiple people and soak a few skillshots while dealing more than no damage; this would include people like Irelia , Xin Zhao (E>Ult), Wukong (E>Ult), arguably Fiora (Ult>Q, massive heal) and Aatrox (E>Q>sad ult). You might also argue bruiser Diana.

Aatrox's niche is healing himself while fighting and turning the tides of battle; he only really fulfills that first niche. I believe that by adding a unique effect to his ult we can give him that "dive fighter" feel that he is and not make him useless. Most CC's are a flat value but dive fighters love diving into multiple people and causing mayhem. What if he had a unique kind of scaling on his ult that applied a longer fear for each enemy champion hit?

For instance, a stacking .5 second fear for each enemy would mean if he dived botlane at 6 and hit both adc and supp, each one would be feared for 1 sec. Midgame team fights might get off a 1-2 second fear, if he hits 2-4 people with his ult. He could get off a 2.5 second fear if he somehow hits the entire enemy team. That sounds a lot more dive fighter-y and is a unique ability in it's own right.

This is a fairly powerful effect but I feel that Aatrox damage is comparably low to someone like Wukong or Xin that he wouldn't really need to be nerfed for it.