The prophecy

Pantherclan, snowclan, leopardclan, mountainclan, lionclan, cheetahclan, and tigerclan must unite to become one or else their ancestors may leave forever......

Swiftfur of cheetahclan, and Hawkpaw of mountainclan break promises causing the two brothers to perish
Eaglewing of pantherclan causes trouble causing his kin to fall
Tinyclaws of tigerclan must find her place in her clan, for being part snowclan
Featherpaw of snowclan must find her way through the mountains
and Leapfeather of cheetahclan must find her place in the stars