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As DK healer/support should I cast igneous shield?
As a DK Healer you mainly use it for Major Mending, which is a great buff. I personally find I don’t need it much at all, and it is very tedious to cast it often. I mainly use it in those moments where you need a powerful heal or you know a heavy hit is coming on you or an ally. I don’t believe it overrides the tanks shield though I could be wrong.
The issue does exist still unfortunately, but as a dk healer you can spam it more, get major mending. Just wary of being close to tank so you don't override it.
I also welcome you to join discords made by your class representatives to share more concerns.