- As if being a sea serpent big enough to encircle the world wasn't scary enough, Jormunqand the Midgard Serpent of Norse Mythology also has poisonous breath. In the Final Battle of Ragnarok, Thor breathes in too much of Jormunqand's breath while beating it to death with Mjolnir. He's Badass enough to try and keep going, but only manages to take nine steps before finally dying.
- The Dragon of Beowulf is the fairly standard fire-breathing, treasure-hoarding, cave-dwelling kind. It probably eats people, too, but we never see it.
- Add to the list the dragon Fafnir, of the Völsunga saga, also from Norse Mythology.
- Older Than Dirt: In Egyptian Mythology the sacred uraei and serpents of the Duat breathe fire to protect the king and gods.
- The Nuckelavee of Scottish mythology had diseased breath, which blighted plants and made humans and animals ill.
- According to the Book of Revelation, when Jesus returns during the end times he will be able to breath swords... apparently intercontinental ballistic swords... or something
Revelation 19:15 "And out of his mouth goes forth a sharp sword, that with it he should smite the nations..."
- A common version of the mythological beast catoblepas describes it as having poisonous breath (one description of the poisonous exhalation, curiously, matches the properties of the now-well known toxic gas phosgene).
- One of the Fomorians, the legendary race who ruled Ireland before the coming of humans, is said to have had a terrible eye that turned people to frozen ice, and breath that touched everything with the blight of deep winter snow and frost. Michael Moorcock wrote the second Corum trilogy as a thinly-velied Expy of Irish myth where the "Fhoi Myore" rule the land.