Toothless' Nemesis

This is an unnamed Whispering Death is a Whispering Death, who holds a serious grudge with Toothless. He appears in the Riders of Berk episode, What Flies Beneath.

Dragons Riders of Berk
In episode 14, this Whispering Death appeared. He held grudge against Toothless who had bitten him. He got into two fights with Toothless. In the first one, he showed himself to the gang. In the fight Toothless wrestled with the Whispering Death until he shot him in the leg with spikes. In the second fight Toothless was unable to fly. The Whispering Death knocked him out of the sky and used his fire to send him onto a ledge. The Whispering Death then tried to send Toothless into a Canyon, which would kill him. Only by accepting Hiccup's help was Toothless able to defeat the Whispering Death. Toothless spared the Whispering Death, and it fled back to it's tunnel.