Originally Posted by
davidmage
By stack do you mean if they all heal their full potential when healing the same target? If you use them at the same time on a damaged character, each heal will heal more than if you use them following each other (because the missing hp part will be less after the first heal). That kind of synced heal can only be performed by us boxers I believe, so thats a bonus for us.
Also I recently got my second gold trait Light of the Titans. That HoT x5 on your tanking character helps. I've started to use my heal just before engaging bosses to apply that HoT.