Iverra's Diving Helmet Doesn't Work on the bog dragons; and we think we know why!

Just tested it after an interesting discussion here, and the helmet doesn't give a bonus against dragon breath for the Llengrath fight.

Maxquest added this:

Diving Helmet provides two persistent buffs:
ResistKeyword 35 vs DefenseType (5) {None}, Keyword ("DragonBreath")
ResistKeyword 20 vs DefenseType (5) {None}, Keyword ("poison")

This means that it adds 35 to a defensive roll vs any spell or ability marked with "DragonBreath" keyword, and it doesn't matter which defense is targeted.

P.S. Alpine, Sky and Adra dragon breaths are marked with "DragonBreath". While Turi and Gafo breaths are marked with "DragonBreath Poison". But I don't know if this helmet provides 35 or 55 defense vs them, or even if "DragonBreath Poison" is recognized at all, because there are no keywords on their respective tooltips.

and this:

Have to note that if the project is big (and PoE is), it would make sense to put these keywords in a separate static class and use global constants instead of hardcoded strings.
If I remember C# syntax correctly, something like:
public static class KEYWORDS
{
  public const string POISON = "poison";
  public const string DRAGON_BREATH = "dragon_breath";
}Easier to mass rename, and safer.

Thanks for your time!