Thrasta

Thrasta, Tempest's Roar, is a dinosaur from an unknown plane.

History
Thrasta dwells on a plane beset by never-ending storms. On nights when the storms are at their fiercest, it will find the nearest location of high elevation it can so it can be struck by lightning. The lightning doesn't dissipate - instead, it crackles over Thrasta's hide and charges up the big dinosaur. Only once Thrasta is full to bursting with the storm's power does it go off in search of its siblings, to challenge them in battles that wreck the forest and shake the foundations of the earth itself. Its ambition is to one day drive out all its siblings and be the apex predator of the entire forest.