Hey,
So last night I was bored and thought I'd dig out an old lvl 28 brewmaster alt that I'd not touched since Legion came out and do some easy tanking...
Obviously, at that level, there's a lot less in your rotation.
However, Expel Harm was there - a level 26 spell. It draws on your healing spheres to heal you and do some damage to your enemies. Now, I might be missing something but as far as I can tell, you actually generate healing sphere's only from Gift of the Ox - which is a level 40 spell? Is there some other way of getting them?
So, Expel Harm is actually completely unusable until level 40 anyway?