Summary: My entry for the Secret Jackalope 2020 community event over on the OSR Discord. The request in question was as follows:
"A random generator of "lost races": origin, features, technology/magic/artifacts, vice, reason of disappearance/decline, how many of them remains and in what form? Maybe put this on a d6 (or d10) table, with a column for each detail. Pulp, early science fantasy style."
- by evil scientist of Eldritch Fields