Talk:Karma/@comment-4022742-20161220203503/@comment-1666421-20161221114449

But 40 AP + 10% bonus healing/shielding will give you more than either 80 AP or 20% bonus healing/shielding would. The stats are multiplicative.

Also, the 10% obviously applies to your W heal as well, not only your E. (Big deal for tank build.)