How do you make a cloak spell as a constant ability?

[Oh shit WTF]

I want to make Alduin so that he equip himself with elemental cloak spells once he's under 50% of the health threshold. I tried to make it by duplicating the existing cloak spell and magical effect and changing it from spell to ability and constant effect. it kinda worked but I got so many flame damage effect icon spammed on the right top corner of the screen. then I toggled on "no recast" and now I got a single infinite flame damage effect that 100% kills me no matter where I am. Any help would be appreciated.

[traison]

The skyrim engine has these unwritten rules. Typically the way I do things is try to find a similar implementation in the vanilla game, and base my new idea on that. If one does not exist I go into it prepared to run into another "unwritten rule". So, is there a constant cloak spell somewhere? Ebony Mail comes to mind. How does that work?

 

"Plan B" here would be to script it, that is, do a regular cloak with a script attached to it and simply recast OnUpdate to make it seem infinite.