Mandusus

Mandusus was a constellation that may have been located in Mutter's Spiral or in a nearby galaxy.

Mandusus was destroyed when the Master obtained a segment of the Key to Time and ripped the constellation apart. (PROSE: Cold Fusion)

Peri and the Sixth Doctor encountered the Daleks there some time after the events of Necros. (COMIC: Emperor of the Daleks!)