Sunflash befriended the kestrel, Skarlath, after they had saved each other from Swartt Sixclaw. Sunflash and Skarlath became inseparable friends as they grew up together and wandered through Mossflower, defending the weak and helpless.
Sunflash's original hornbeam branch was molded into a formidable club, spiked with arrowheads and speartips, that came to be called his "mace". Sunflash and Skarlath then made their way into Mossflower woods where they rescued the families of both Tirry Lingl and Bruff Dubbo from a group of foxes. The two befriended the families and stayed with them for five seasons. When Sunflash saved the children of Tirry Lingl from adders, he received deadly wounds. While near death, Sunflash had a vision of his father Barkstripe, his grandfather Boar, and his great grandfather Brocktree. They told him that he must live on and journey to the mountain Salamandastron to become Badger Lord. With this message Sunflash awakened from his slumber and journeyed to Salamandastron the next day. He encountered many conflicts on his journey, and with the assistance of Skarlath, successfully made it to the mountain. Sunflash became Badger Lord of the mountain and was widely respected and loved by many. When Swartt laid siege to the mountain, Sunflash rose to protect it. After his beloved friend, Skarlath was killed by Swartt's vermin, Sunflash went into a berserk rage. He and his hares hunted down the horde and the badger made an end of the ferret at the summit of Bat Mountpit. Shortly after, he traveled to Redwall Abbey and was reunited with his mother, Bella of Brockhall. He stayed with her until her death before journeying back to Salamandastron to continue to rule.