Using the 3rd word of the Fire or Frost breath shout unleashes a long-lasting dragon-like version. Just like DragonFire, but better (no offense to the author of DragonFire). The fire breath sound effect is a lot more dragon-like; but most importantly: this mod is balanced.
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File credits
The Skyrim Creation Kit was used to make this mod. A very special thanks to Straidy from Deviantart for letting me use their picture.
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I made this mod out of a whim. I was expecting a better fire breath after obtaining the final word of Fire Breath. I was really hoping to do it like the dragons do: a longer lasting beam of inferno! But what do I get? A same-old fireball that does a little bit more damage. I was about to post this mod, but I noticed another mod called "DragonFire". It did exactly what my mod did... but... something was off: it had no special three-words dragon-scream, and it was EXTREMELY overpowered. It changed the shout timer of Fire Breath to 3 seconds for the first word, and made it MORE powerful! This mod does what DragonFire does, but in a very balanced way. The timers don't change for the first two words, and neither do their properties. The third word, however, is more powerful and does a longer-lasting dragon fire breath, but the timer is bumped up 20 seconds. This applies to both the Fire and the Frost Breath shouts.
TL;DR: This mod changes the Fire Breath and Frost Breath shouts to be more dragon like whenever you use the 3rd word of the shouts. This mod is balanced.