Revenge - Eyulf's Backstory

In a land, where all things things that had everything. Love, peace, joy and justice. But when their new alpha strikes, the darkness began to rise and this killed many wolves. Eyulf parents was caught and killed and forced Eyulf to become one of their tribe. They trained him, abuse him and even battle him for his training. Yet one day he seeks for a revenge to kill their alpha, but he could not possibly do this alone but an unknown spirit helped him- who could it be?