Skrill

The Skrill is a medium-sized Strike Class dragon that was first mentioned in How to Train Your Dragon and first appeared in Book of Dragons. A jolt from the Strike Class, this Dragon is among the most feared Dragons. They can summon lightning to shoot electrical blasts. The spiny Skrill attacks with balls of lightning more powerful than any natural storm. Skrill eggs are round and usually come in shades of blue or purple. The color of the hatchling will match the color of the eggs. The eggs are surrounded by lightning bolts zapping around them. Its center core glows very brightly, although it is unknown if the bolts are actually electric or if they are just ornamental. The Skrill has large wings and spines on its back and tail. These spines are metallic in nature and conduct the arcing electricity that it uses as its unique firepower. The Skrill possess a crown of spikes on its head which are all about the same length. The Skrill's 'crown' can be used to steer the dragon. Skrills have three short spines on their chin. It also appears to have four shark-like gills on its neck. Its head slightly resembles that of a Thunderdrum or a Flightmare. The proportion of its head, body, and wings are quite close to that of a Flightmare's. It resembles a Night Fury in flight and almost rivals its speed, being only slightly slower. It is the size of a Deadly Nadder, but incredibly fast. This dragon has been shown to walk and run on its two legs with its wings folded.