Stratus and his mate, Nimbus.
Last winter, Stratus set his sights on the Beans' pack's south-western territory. Though they fought bravely, the Beans were no match for the Compass pack, and by the time Spring rolled around, the Beans were gone and Compass had moved in, just in time for Nimbus to give birth to her sixth litter.
The last Guiding Star to take their place in the constellation was...
Amethyst Mountain was where Pyxis was born, and where he would die, though he lived most of his life in Lost River until his beloved mate—Cygnus—passed in her sleep.
Without her there to keep him in orbit, Pyxis left Lost River, and the Compass Pack, to his son. He spent his eighth year in Amethyst Mountain, waiting for time to catch up and reunite him with Cygnus.