It seems that I have to change the order with which I make the fantasy games on my bucket list, because the intended title is used as a story element in the first two games in the line, and somebody else might take the title for their own game because the term uses real words. I can't risk going over the apparent three year limit for registering trademark ahead of time.
"The Great Wall is great. But, most people can only be the slaves who built it, leaving their bones underneath that wall. They spent their whole life to build that wall and the empire, an empire that enslaves them." I'm just going to turn it into a modern-day sad tale.