The IKS Drovana was a Klingon Vor'cha-class cruiser crippled in 2372 by one of the cloaked mines the Klingons were secretly laying around the Bajoran system.
The Drovana appears in the Deep Space Nine episode Sons of Mogh. Kira and O'Brien, flying a runabout, witness an explosion near Bajoran space and find Klingon ships on unexplained manoeuvres. Soon afterwards the damaged Drovana asks to dock at the station for medical help, its crew suffering from burns.
Sisko concludes that the ship struck a mine, and that the Klingons are seeding the approaches to Bajor so that they can cut off the station if war comes. To find the mines he needs their detonation codes.
Worf and his brother Kurn, disguised as Klingon officers, board the Drovana and copy the data. With it the Defiant exposes and destroys the minefield.