Sup /bant/

I'm not sure where else to ask this and I figured there would be dirty foreigners who are catholic/speak a romance language with a basic grasp on Latin who might be able to help me with this.

I'm writing a board game about the Germanic migrations which killed the Roman Empire. I want to call it whatever "Death of an Empire" is in Latin, but for the life of me, I can't figure out how to phrase it properly. Google translate is no help.

I know death is something close to 'mortis' and empire is something close to 'imperium' but besides that i'm clueless.

pls respond. If this is a shit name I am also open to suggestions. Please and thank you xx