Spirit Visage might need to be looked at for the percent healing.
Rhaast form is very strong with Spirit Visage and just 1v9 2 tanks 1 mage 1 assassin and 1 adc with no problem without even popping GA. It would be awesome if I could get some answers or even maybe the balancing team to take a look into this item. Sorry didn't realize that the link got messed up when uploading it here is the clip.