A weapon engraved with a Rune of Fire has the Flaming Attacks special rule.

A weapon engraved with two Runes of Fire has the Flaming Attacks Special rule, and grants its wielder a Strength 4 Breath Weapon with the Flaming Attacks special rule.

A weapon engraved with two Runes of Fire has the Flaming Attacks special rule, and grants its wielder a Strength 4 Breath Weapon that has the Flaming Attacks and Multiple Wounds (D3) special rules.