Spectre soul boost and mephisto

So we'll fighting mephisto just before the fight I activates the spectre soul buff. Should reverse all healing effects. Yet when I got mephisto down to 30% he still regened as normal... is this a bug or is this buff supposed to be useless on him?
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I've used it almost every time fighting him and got the heal block not the reversal. Thanks for clarifying
This. Almost every single one of these threads about Mephisto's regen is caused by people not realizing that the debuff goes on and off on a timer and is not on constantly during the fight.
Agree to disagree...i understand fully how his mechanics are supposed to work. But when you have the Spectre Boost (heal reversal) it does not work as intended half the time. He still regen's during the fight. Players gettings shafted yet again with no peep or any type of reconciliation act
Even if you activated right before a fight, there is still a timer in the fight where the effects will activate and deactivate.
There is nothing in the boost description that says this is how it works. Is there an off/on cycle timer on the rest of the boosts?
Why can't you put out items with descriptions that clearly explain their basic functioning? This doesn't seem like a lot to ask. You included no information on the duration that any of the boosts last for either. I believe the ghost rider boosts had this info as do all the boosts in the boost section of the store.
What I stated is just a fact. There is nothing to agree or disagree with. The way that it works is not dependant on your approval.
Why comment the same thing 3 times in different threads?
There's an awesome boost in the game already that protects against incinerate, and you can get it in arena right now!