From Age of Sigmar - Lexicanum
Dread Saurians are powerful Seraphon, celestial reincarnations of reptilian monstrosities from the Age of Myth summoned by the power of the Slann. They attack their foes with their enormous raking claws, fang-lined gargantuan jaws and armoured tail. As predators these creatures are quite adept at hunting the beasts of the Mortal Realms. They have glyph-covered plates covering their bodies, which are empowered by the Slann to greatly improve their healing rate. Smaller seraphon, like Skinks, have their resolve bolstered by the presence of this manifestation of a Slann's will, but their roar has the opposite effect on the enemy, sending them running in panic.