Soul of a dragon (httyd)

Viper is 15 year old Berserker viking. She was taken care of by her grandfather but he died and she fell into the clutches of her cousin, Dagur the Deranged. Dagur thinks Viper is useless and unfit to be Berserker but Viper wants to prove him wrong and all the other Berserker vikings. So when it happens at chance that the Berserkers stumble upon a legendary dragon, Viper sets out to do the most daring thing a Berserker can do. She forms an unbreakable bond with the mighty Skrill. But what happens when Dagur wants to destroy his enemy tribe, Berkians, using the electric power of the Skrill. Will Viper be able to gain the trust of Hiccup and his friends and will she be able to help them defeat Dagur?