The planet Dvorak, which seems like an unpleasant place all told, is the homeworld of the Dvorakian Empire, a massive interestellar power the LNH has not encountered directly, which is probably for the best. They have a way of destroying anything that gets in their path.
They were involved in the first Great Flamewar, where the Dorfian armada killed six trillion of them. At some point, they became a violent expansionist power themselves, locked in a feud with the Qwertians. In the end they won, completely devastating the planet Qwerty, with Dev-Null the only known survivor.
It is named after the lesser-known Dvorak keyboard layout.