This was an actual, proper computer adventure game a la
Fate of Atlantis - before that genre got decent graphics and point-n-click gameplay, they were all text and imagination based.
Revenge of the Ancients was the first Indiana Jones adventure game, and arguably the first original Indy story in gaming (
The Lost Kingdom was the actual first, but that wasn't even really a story).
There's a remake in progress
here, and I'm helping write the story, dialogue, puzzles etc.
As there's not much info on the original Olmec culture or the game's Mazatecs, I was mostly going to go with a combination of Mayan/Aztec
legends (which the game did anyway) and have The Power Key be the key to controlling the Earth's elements. It was used by the gods to destroy the Ancients, the original people of the Earth, and was the cause of the Great Flood mentioned in so many creation tales - including the Bible.
The Nazis in the new game are not just after the devastating power of this Key, but they also wish to resurrect the Ancients - who they believe to be the original Aryan Master Race they themselves originated from.