Antishield/Antibarrier item

[HalcyonMoth]

Would it be too bad of an idea to have an item similar to healbane, but which targets shields/barriers mainly, like "doing spirit damage causes shields applied to be x% less potent"
Had this idea with the introduction of celeste

 

[Khanzy]

Too niche. Just make anti heal apply a certain effectiveness too. Doesn't have to be 35%. Could be a separate number.