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The Lizardmen tribes born in Nyzzet's dungeon were often very rudimentary and savage, although these beings had the potential to develop greater intellect and civilization, due to their monster nature, this potential was often never showed.
Of course, this changed a few hundred years ago when the first Elder Dragon to have been born in Nyzzet's dungeon, Goghesdum appeared and by using the inherited intelligence and knowledge of its previous life as a mage and scholar, he led the Lizardmen tribes into a new future.
It was certainly hard at first, as the Lizardmen were born and raised like monsters, awakening their intelligence was too hard, and the first generations were only domesticated by Goghesdum like tamed monsters which he slowly taught how to be more 'human' while also expanding their strength and minds through his blessings.