Is Ungil's Harmony working as intended?

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Maxtrux wrote:

By the description you are giving, I think you are referring to Perfect Agony. Pain Attunement is just 30% More Spell Damage while on Low Life.

I somehow hinted it when I said "Mind, however, that what said above only applies to hits". The implication is that Damage Multiplier for Ailments from Critical Hits uses a different multiplier from the one for critical hits - as shown in the Offence character tab.

Pretty sure we already went above it in a previous topic about how Coralito's Signature (and Perfect Agony) and Elemental Overload interacted. I remember the lesson we shared back then.

Your intervention is much appreciated, by the way. I was wondering whether write a longer, more complete answer and risk it being skipped for TL:DR , or just give some basic explanation and let other players share their own insights and experiences. Last time I gave a full explanation it didn't went... well.
So, really. Thank you.