🔨 null damage modifiers and breath damage - possibly new modifier needed, or existing ones adjusted

[illzbee]

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Describe the feature

Need mod to occasionally nullify breath damage NULL_BREATH_DAMAGE

by percent like NULL_PHYSICAL_DAMAGE

[TeoTwawki]

frustrated noises

things that literally cannot be done we're much more forgiving on than things people simply didn't do. use physical and magic nulls, and raise an issue calling out this item by name so it isn't forgotten. I had actually just posted to Xaver-DaRed back on the discussion about elemental nulls, because I think unlike the generic magic one I am not sure they should care about the source of an element. But we should probably just one mod that covers "all types of damage". It's also possible breath bypasses this mechanic.

This is for the poroggo cassock+1 being brought in by #2307