flavor text

In a game, sometimes items, actions, or mechanics etc. will have flavor text, which are just extra snippets of text that aren't related to actual gameplay rules or affect anything-- they're just there for effect. It's pretty much just fluff, but it can add realism, enhance the tone, include extra background information or narrative, or be funny.

*While going through dialogue in a game*

Person A: Wait, I think I skipped something. Was it important?

Person B: Nah, it's just flavor text.