This is generally a support build but in late game you can start doing damage and the AP really helps your heal and your Q ability because even though you can deal damage you are still solely a support so i like building more AP than AD and deathfires is a really good damage dealer and guinsoos is self explanatory for Kayle.

Kayle is an amazingly strong character and everybody should try her out. This build is one i tried and thought was really good and decided to share with you all. he is also one of my favorite champs and you will have people crying over how powerful you are.