Skrill

The Skrill is a dragon appearing in How to Train Your Dragon (film). It is seen in the Dragon Manual while Hiccup looks for more information on Night Furies. The Skrill is a large, reddish-brown dragon with a medium-length snout and small, beady eyes. It is assumed it can breathe fire.

As most of the dragons in the manual, it is listed as being "extremely dangerous" and the manual instructs readers to "kill on sight".