My main concern are the go there, kill that quests that envolve Drugr. I have a few stat bonus and malus spells similar to yours.

The Dragon priest idea, although quite good, it doesn't take care of the finishing quests that require dead npcs.

I really like the cow idea but as others have mentioned, dragons are supposed to be immune to all illusions.

I get the chicken chaser name I just don't think it's a suitable name. What about 'Cat and Mouse'?

If not, maybe I'll just go with the my first suggestion.

Edit: I had to make the spell in reverse, so aggro on the ouside and fleeing on the inside. The problem was that it rarely would work but when it didn't(4/5), the npc ran in my direction instead of to the fleeing npc(tested with lvl 100 sneak and invisibility right after spell launch at a distance).

You can call it what you like. I think Chicken Chaser has a bit of an easter egg quality to it and it is good for a chuckle. You still have to be familiar with the original Fable to get the connection and the game is 9 years old. There are Skyrim players who haven't played other Elder Scrolls games.

I can't think of anything Elder Scrolls specific.

Whatever works.

I played through Fable once or twice, I probably used swords exclusively because I don't remember much about the magic system. Yea, I'm fully aware about the current players who can't wait for the next 'Skyrim' action game..

Okay, I'll just go with mass chaos, seems to integrate well with other spells like mass hysteria.