Thunderdrum

The Thunderdrum is a large Tidal Class dragon that was first mentioned in How to Train Your Dragon and first appeared in Book of Dragons. In the movie short Book of Dragons, the Thunderdrum's egg appears to have a base color of aqua with lime green speckling. In School of Dragons, the eggs have electricity running through the eggs. The egg's core is glowing while the exterior is a lighter shade of blue. In Rise of Berk, the eggs come in various colors and have a slightly more pointed top. Faint specks can be found in its...

Fire

Sonic blasts

Size

Large: 130 feet

Habitat

Oceans

Attack / Armor

12 / 10