From Destinypedia, the Destiny wiki
After an update with The Taken King, the weapon's exotic perk was changed to Napalm, in which after the weapon is fired, a Solar damage napalm canister is dropped and detonated, causing additional damage over time.
From the labs of Feizel Crux and Victor Lomar comes another shoulder assault offering built to match the incendiary fury of a legendary beast — or at least classic depictions of it.
Carrying three rockets, each equipped with Solar Flare detonators, its power is believed to far outmatch those of the mythical flying monster, but we're still hoping an actual showdown between the two will put an end to that argument.
The main perks are Tripod and Pyromancer. This meant that Dragon's Breath could carry three rockets in the chamber, each of which left behind a solar flare upon detonation.
Dragon's Breath was totally revamped. Its exotic perk is now "Napalm", which allows the user to hold down the trigger to delay the rocket's detonation until the trigger was released, thus detonating the rocket and dropping a napalm canister, which leaves a huge swath of fire that excels at crowd control, area denial, and damage over time.
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