Serana The Lost Grounder

This is a 100 fanfiction!
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Serana ran away from home when she was 10 years old and disappeared off the face of the Earth. Some believed that she had been killed by rouge grounders, others believed that she changed her name and moved to the dead zone. Serana reappeared 2 weeks after her sisters death when Roan The Ice King, sent a messenger to find her. Serana is faced with the horrific knowledge that the old leader of Skaikru had killed her sister, and must decide to ally them as the 13th Clan, or kill them all to avenge her sister.