Goosefeather and Featherwhisker

Warriors: The Ultimate Guide
"Goosefeather and his apprentice, '  Featherwhisker, were medicine cats during Pinestar's leadership of ThunderClan. Goosefeather was a naturally skilled medicine cat, but by old age he became better known for his laziness and sour temper than for his original talents. He took a close interest in Bluefur, who would one day become Bluestar, and her sister, Snowfur, because their mother, Moonflower, was his littermate.

Goosefeather had a habit of interpreting omens in the darkest way, and in the end, it was his doom-laden prophecy that led to the battle with WindClan, and Moonflower's death. Goosefeather interpreted the flattened fur on a vole from the fresh-kill pile as a sign that WindClan would crush ThunderClan, kill all the warriors and destroy their territory. Strong feelings stirred up in the Clan left Pinestar with no option but to attack WindClan first. A second omen--a shred of catmint on the vole's flank--was seen by Goosefeather as a warning from StarClan that they must invade the very heart of WindClan, inside their camp, and destroy their supply of herbs. It was a bold plan and ultimately disastrous, leading to death and defeat for Thunderclan warriors. Goosefeather was unrepentant, insisting that his omens were correct.

Soon after the battle with WindClan, a branch was struck by lightning and fell, burning, between Bluepaw and a threatening fox. Rain swiftly came to extinguish the fire, and Bluepaw and the woods were saved. To Goosefeather, this was a  prophecy about Bluepaw herself: that she would blaze through the forest like fire, quenched only by water. Bluepaw had no inclination to take his words seriously, not after he had prompted the battle that killed her mother.

From that moment on, Goosefeather's mind wandered from the dedication and curiosity essential for a medicine cat, and his Clan turned more and more to his apprentice, Featherwhisker, instead. Goosefeather retreated into a world of sinister omens, and an unfailing conviction that ThunderClan was on the brink of destruction. Featherwhisker took over all the medicine duties with a calmness and sense of optimism that had been missing in his mentor. Goosefeather's final act of madness was to react in horror in the presence of Tigerkit, Pinestar and Leopardfoot's sole remaining son. He confided to Bluefur that Tigerkit should never have been born, and he urged Blue to become deputy instead of the ambitious warrior Thistleclaw, whatever it took.

Whether he interpreted omens correctly or not, Goosefeather shaped the future of ThunderClan by setting Bluefur on the course of her destiny. But she was glad to have Featherwhisker by her side by the time she received her nine lives as leader of her Clan.

Trivia

 * Featherwhisker was a gentle, sweet-natured and kind mentor.