Dragon's Breath was basically Destiny's first Grenade Launcher, I'd love to see it re-imagined in Destiny 2. The linked image is just an idea I threw together based on the M79 and the F-4 Phantom, since the original Dragon's Breath seems to be tied to the Vietnam era by its Napalm perk.
*edit for [url=https://www.deviantart.com/derekab/art/Phantom-Jaws-822458161?ga_changes=1&ga_submit_new=10%3A1575504701&ga_type=edit]link[/url] (Apparently Deviant Art hates short image links.)
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In what way was Dragons Breath a grenade launcher. It fired rocket propelled napalm canisters.