Warriors: Rainshine's Destiny (A warrior cats fanfiction)

Nightclan, Sunclan, Oceanclan, and Mountainclan, all have lived in peace for centuries, but when a very cold winter hits the four clans, killing off more than half of all four clan's population, Mountainclan starts to turn back on their ancestors and starts attacking the other three clans. They take countless lives, steal prey and territory, and won't stop until they have full control over the four clans.

Rainshine and Needlefur are inseparable. They hunt and fight together, they eat and sleep together; they are the perfect brother-sister duo. Things take a turn for the worst when their mother is brutally murdered by Mountainclan warriors. Both siblings cant get over their mother's death, set out to unite the clans, and take out Mountainclan, but in very different ways.
Can Rainshine beat the feral Mountainclan warriors with the help of Nightclan, Oceanclan, and Sunclan, or will they all perish at the wrath of Mountainclan's claws?