Deathsmiths of Goth

The Deathsmiths of Goth, expert weapons designers, were once more feared than the Daleks.

On their home planet of Goth, they created a superweapon known as the Apocalypse Device, but this creation went out of control and began killing them. To contain this weapon, the Deathsmiths destroyed all starships on the planet, leaving the Apocalypse Device stranded on Goth among the ruins. (DWM: Black Legacy)

The Daleks acquired weapons from them for their battle against the Time Lords in the Last Great Time War. (DWAN: 2006 Doctor Who Annual)