The Whispering Death is a large Boulder Class dragon that was first mentioned in How to Train Your Dragon and first appeared in Book of Dragons.
A Whispering Death has the ability to burrow with it's sharp teeth and spikes.
Every 100 years of female whispering death will hatch a dragon called the Screaming Death, an albino but larger Screaming Death that lets out of supersonic screen that disrupts a dragon's hearings and makes them disoriented.
Weapons: Inferno, Astrid Hofferson's Axe, Hiccup's Viking Helmet, Hiccup's Shield, The Mangler (Hiccup's Bola Catapult), Dragon Root Arrows, Toothless' Saddle and Tail Fin, Dragon Scale Armor, Deathgripper Venom
Plants: Dragon Root, Blue Oleanders, Purple Oleanders Other: Yak Nog, Bork's Papers, The Book of Dragons (original, The Nine Realms), Hiccup's Prosthetic Leg, Astrid's Betrothal Necklace, Gobber's Peg Leg