Verisimilitude

Verisimilitude is something you may want in your games. Maybe, I don't know you.

It can be done following these two steps:

1) Come up with a bunch of cool names

2) Connect them in a diagram, and then figure out what those connections mean

... And you're done!

Verisimilitude, which is really just an aspect of internal coherence, is felt when there are details (the cool nouns you made up earlier), they'ree connected (ditto), and those details and connection are not randomly forgotten (you may want to record them somewhere)