Tales of the Berserker Isle

Of Dragons and Leviathans pt. 2 Sequel to: Tales of Berk' Hiccup leaves Berk with the dragons to stop his transformation into a monster. Their first stop is on a familiar island, with familiar faces. Animosity is building up within the Berserker Tribe, how will Hiccup's arrival affect the situation? (Required reading of the sequel for plot)