Ok a while ago me and my brother did this thing that was fun and I thought you guys might find it interesting.
So what we did is shared a google doc and started with three words/phrases
For example
Un-Dead night
High emperor kuthlink
Fiber grade coat
Then we would take these and write a paragraph about it introducing new words
Un-Dead night - a un-dead night is a time of year in which the cyber legion raises from there crypto vaults. These started after the 15th century AGD (After God Died) fall of the empire of Jade …ect
So then from that we would take these words and make new definition and on and on expanding the world and lore