Dragon's Breath has one of the coolest pictures, and pre-TDB when I saw the picture I was excited to get my hands on it, then I got the gun.
It's not a bad rocket launcher, but to me it's lackluster and falls below expectations.
The weapon is modeled after the P-40 Warhawk paint jobs, and the Halo 3 Flamethrower, which is such a badass concept, and then the weapon description says [b]"Burn the World, Burn it All"[/b], yet it doesn't set things on fire, why not?
Dragon's Breath in my opinion should change the Pyromancer ability from a solar flare, to a Napalm explosion. After the initial detonation, all targets still alive should be set on fire. Then make it cover the ground/walls in fire for ~5 seconds, and if an enemy walks into it will set the target on fire and continually refresh the DoT until it leaves the area on fire or it wears away after the ~5 seconds or whatever. This will truly be a pyromancer's dream weapon.
In relation to damage output, using 331 level 32 base and whatnot, standard rockets do ~3000 damage or whatever, and then of course the beloved Gjallarhorn Wolfpack rounds total ~2000 damage. I propose for the Dragon's Breath for DoT, do somewhere around 1000 damage over 5 seconds or so (not really sure the optimal time, less time means more burst, more time means more sustain for things like shields).
This change would make keep Gjallarhorn as the best single target launcher, dealing ~5000 per rocket, but bring dragons breath to the better AOE rocket, at ~4000 damage per target in the immediate blast radius, and then approaching or equal to its current ~6000 if the target stands in the fire the full duration. This way stationary targets will take the full damage, but also targets that leave will still take a portion of the damage.
Also on a final note, the exhaust pipes on the sides should have small jets of flame or glow red when the rocket is fired because that would look pretty sweet.
Edit: The exhaust pipes do glow red, I never really noticed it with my lack of usage of the gun. That's awesome because they should.
Edit2: Reworded some of the thread to clear confusion some people had.
Edit3: Adjusted the numbers to better fit the current state of the weapon.