Dyragan

The Dyragan has been a symbol of both power and judgement. It is the largest creature of any known beast and unable to be felled by any other creature save for another dyragan. Though most are depicted as the size of an elephant, the few that survive through decades of battles for mates can grow to be several times larger. Their scales are harder than armor and even repel invocational attacks. It is a creature of immense strength, with the power to breath incinerating fire or freezing wind. 
Some even believe the dyragan has the ability to walk in between dimensions due its colossal size yet enigmatic absence throughout Ferrathar.

“I send upon you the embodiment of my righteous wrath, the mightiest symbol of my power that man can comprehend. See how the wind from his mouth turns stone to magma and trees to ash. See how the fortresses you have built in defiance to me are but parchment to his teeth. His tail carves fissures into your lands, his claws uproot your homes. No weapon can pierce his hide because no armor can match it. Your sentence is carried out in his wake and he hears no plea.” - Section 14 from the tome of justice