The body of a Thunderbottom is similar to that of the Thunderdrum parent, but sporting the heavy build of a Gronckle. The tail ends in a heavy bludgeon, similar to that of a Gronckle. The Thunderbottom has a large head with a wide mouth lined with teeth of both a Thunderdrum and a Gronckle. It has a small bumpy nasal horn and bulged eyes. The Thunderbottom has a pair of external ears and a long row of small narrow spines along its back and tail. The Thunderbottom has three protrusions on both sides of its head, like the Thunderdrum and several bumps on its body, similar to those of a Gronckle.
A Titan Wing Thunderbottom is significantly larger than its adult counterpart. It has bigger and sharper spines and teeth. Its wing claws become thicker and gain the shape of a hook. Its bumps turn into triangular spikes that have a weak glow.
Thunderbottoms have a powerful tail in the shape of a bludgeon, that they can use for offense. By swinging it back and forth, Thunderbottoms are able to destroy entire buildings in a matter of minutes.
Strength and Combat
Academy scouts identify potential packs by looking for patches of fallen trees, which they often knock over with their massive bodies while play fighting.
Thunderbottoms appear to be aggressive and territorial at first, but once one gets to know them better, one can discover their softer side. Thunderbottoms are a social species, that live in packs. They tend to look out for each other, especially their young. Thunderbottoms often fight among themselves for the purpose of entertainment, even as adults. This makes them accidentally knock down trees nearby, which signal other animals to their presence.
In other to train a Thunderbottom, one must prove to the dragon that they mean no harm. Scratching its belly or giving it food are the easiest way to gain a Thunderbottom's trust. Once tamed, the Thunderbottom will remain loyal to its trainer and protect them at all costs.