I havent check this out, but I think that this bonus will not work as additional %. It means that it wouldn't be 15% of healing. But It'll be 10% of this 5% heal. So it's like, you normally heal 250 without this set, but with this set it would be 275. 

Correct me if I'm wrong.

Thanks, I read a little since and I think you are right.

Biggest heal so far, 670. I guess I need a full set Def with def% as main stats + lvl 50 to hope to heal around 2k. Which is ridiculous considering champions like reinbeast put a 15% heal that gives 3/4k every turn ... Baroness cannot compare even with multitargets... So 1 on 1 would be even worst. I hope someone in charge read this and check the balance... Then suggest rebalancing this champ if I am right. 

I was overjoyed until I realized compared to any other defense epic champ, this heal is really weak.

I agree that this healing bonus is really weak, but the whole champ isn't so bad, I actually have it, and use often. But yes, it would be great if the healing could be more helpful.

This is how is build mine, if you would like to see :) I'm still looking for good defense gear, becouse before update this champ has dmg based on attack, and that's why there is offense set still :D