"Heavy firepower" refers to the use of powerful and strong weapons, such as artillery or machine guns, that have a lot of force and can cause significant damage. Full definition
Gary «Army of Trolls» Lucken, the artist behind many fine pixel pieces like Edge's subscriber poster last year, has created a new and awesome «Final Boss» print: a shoot»em up ship defending Japan and its game shops / arcades from drone bee enemies and a panda piloting some massive craft with heavy firepower. (gamesetwatch.com)
Next up is the brutal Devastator / Havoc who packs the most armour and heaviest firepower in the game. (wolfsgamingblog.com)
D - Horse provides free, fast transportation; D - Dog sniffs out resources and can locate, distract, disable, or outright kill enemies if needed; Quiet and her incredibly stupid outfit provide covering sniper fire available in the lethal and non-lethal varieties — watch out, she's really trigger - happy; and D - Walker is a mobile bipedal weapons platform that provides heavy firepower while being hilariously expensive to deploy. (crunchyroll.com)