A Delta Quadrant people who fought a war against the Salinians using self-aware missiles, one of which takes over the Doctor and threatens Voyager in Warhead.
The Druoda are known from the Voyager episode Warhead. They are never seen. Their part in the story is as makers of a class of long-range weapons of mass destruction, each guided by a sentient artificial intelligence designed to slip through enemy defences and resist any attempt to turn it back.
In 2375 Voyager answers a distress call and beams up what appears to be a stranded machine intelligence. It is one of these weapons, damaged and unaware of its own nature. When it remembers, it seizes control of the Doctor's holographic matrix and orders the ship to carry it to its target, a Salinian military installation.
Harry Kim, in command of the night watch, argues with it for hours. He shows that the war ended three years ago and the launch was an error. The weapon then joins other recalled warheads and destroys them along with itself.