I know this looks very similar to this question, but I asked it to indirectly solve what I'm about to ask now (a bad idea).

The Aegis of the Raven Queen (from the module "CCC-BWM-03 A Tale of Two Towers") is a special shield, which does not exist in D&D 5e by default but does exist in Adventurers League play. It has the following passive property:

While holding this shield, nonmagical flames are extinguished within 30 feet of you as the shadow lashes out at the flame.

I also know that breath weapons are considered nonmagical.

What happens when a dragon breathes fire on a creature wielding this special shield?

  1. The breath gets extinguished (and thus doesn't affect the Aegis-wielding creature)
  2. The breath weapon works as normal, since it doesn't really emit "flames" in game terms (and thus the Aegis-wielding creature is forced to make the Dexterity saving throw as normal)
  • 1
    \$\begingroup\$ I don't see why you wouldn't be allowed to. Through googling "Aegis of the Raven Queen", I found it listed in this log as being from "CCC-BWM-03 A Tale of Two Towers". The item and its description are shown in the full-size preview. \$\endgroup\$
    – V2Blast
    Jan 16 '19 at 21:20

The dragon's breath is extinguished

A fire-breathing dragon breathes actual fire

If you look at red dragons' breath weapon ability - for instance, a red dragon wyrmling's Fire Breath action - it says:

The dragon exhales fire in a 15-foot cone.

Fire and flame are synonymous, thus if you had some sort of effect that continuously extinguished flame, a dragon's fire breath would also be extinguished.

A dragon's breath is nonmagical

According to the Sage Advice Compendium, which has this to say under "Is the breath weapon of a dragon magical?":

Determining whether a game feature is magical is straightforward. Ask yourself these questions about the feature:

  • Is it a magic item?
  • Is it a spell? Or does it let you create the effects of a spell that’s mentioned in its description?
  • Is it a spell attack?
  • Is it fueled by the use of spell slots?
  • Does its description say it’s magical?

If your answer to any of those questions is yes, the feature is magical.

Since a dragon's breath weapon meets none of the guidelines, it is not magical.

Thus, since the breath weapon creates a nonmagical flame, there is no reason why this item would not extinguish it.

  • \$\begingroup\$ That is definitely pleasing to read. I don't think it will come up in actual play (fire-breathing dragons are rather scarce to encounter, I think), but nice nonetheless. \$\endgroup\$
    – Gael L
    Jan 16 '19 at 21:19
  • \$\begingroup\$ @GaelL dragonborn can breathe fire too, along with hell hound and other creatures. \$\endgroup\$
    – Vylix
    Jan 17 '19 at 7:15

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