Romulan Mystery (STO)
From Trekipedia
For the Klingon Empire version of this story arc, see: Romulan Mystery (KDF) (STO)
Devastated and broken, the Romulans are united now only by their quest for revenge for a lost world.
Their empress seeks allies and technology from the distant Delta Quadrant, but even that may not be enough to restore her shattered people to their former glory.