Penemu

In the mirror universe, the Penemu were a highly advanced race that were conquered by the $𝜇$.

In the late-2240s the Penemu were forced to develop a highly destructive weapon for the $𝜇$s. This weapon was capable of destroying a class M planet and eradicating its inhabitants. This weapon was tested on $𝜇$ and was partially successful. (SS undefined (Ill Winds))