Found this document in my old Lizardmen files recently called the Conquest of Lustria, saved it back in 2015. It looks to be a fun (and completely unofficial) campaign supplement for 8th edition. Never actually tried this one. I am a big fan of the Events on page 7, lots of cool terrain ideas.
Scenario List: A Favor for Mire Vale of the Slumbering Titan Axtlan's Patrols The Sky Temple Golden God of the Amazons Outrunning the Host Finale- The Slann Awakens