Thunder Lizards are behemoths, so large they dwarf even the mighty Stegadon.
Their tread shakes the earth and their deafening roar can be heard for miles. They devastate the jungle as they pass through it, a miles-long trail of broken trees and trampled vegetation marking their passage. They are omnivores, capable of consuming their own weight in a single day. Woe betide those brave or stupid enough to stand in their way.[1a]
When they charge, it is virtually impossible to stay upright, let alone react with any discipline, and they will pay no attention to things that might frighten other creatures, ploughing on towards the enemy without thought or care of what happens around it.[1a]
Fortunately for the Lizardmen, Thunder Lizards are rare and the jungles so massive that the two species seldom come into contact. Should a Thunder Lizard's distant roar be heard, then runners will be sent to the nearest temple-city and the populace roused lest the beast's path takes it near. A Thunder Lizard passing through a city is akin to a natural disaster of the kind that sunk the settlement of Chupayotl. The chief defence against a Thunder Lizard is for a Slann to bring his formidable powers to bear on the creature's simple mind, forcing it to turn aside from the city and take an alternative path through the jungle.[2a]
There has been one instance in which a Thunder Lizard could not be turned aside. During the time of Lord Amoxixan's second ascension, a Thunder Lizard was observed locked in deadly combat with some form of sea monster that had risen from the depths and come inland from the Tarantula Coast. The combat between the two creatures lasted an entire cycle of the moons, and destroyed vast swathes of the jungle. At the last, the combatants smashed through the outer limits of Xlanhuapec. Though many Slann pooled their magical powers, the Mage-Priests were unable to penetrate the beasts' frenzied minds to steer them clear. When the warring beasts had finally passed on, entirely unaware of the destruction they had wrought in their passing, the ancient Temple of the Lost had been destroyed, along with countless numbers of the irreplaceable relics that had been housed within since before the time of the Great Catastrophe.[2a]
There are no official illustrations or miniatures that represent the Thunder Lizard. In Warhammer Chronicles 2004, Phil Kelly used various dinosaur toys to represent the Great Lizards "army" of the Dragon Isles, including an Ankylosaurus magniventris as a Thunder Lizard.[1a]
The diorama shown at the beginning of the article was elaborated by a Lustria Online user called strategiccommand, who took a Star Wars Dewback toy, repainted it, created a diorama around it and used 14 Stegadon kits, 2 Kroxigors, a Slann Mage-Priest and a few Terradons above to bring it to life, as well as a crystal to glow on top of the Engine of the Gods. He displayed it at the Chicago Games Day 2011 in and then sold it.