Betrayal, Revenge, Freedom: A Story of Two Sisters

When her parents were killed, Iris Fiercewind fought over captainship with her best friend Sylkin Runescape, eventually ending up in throwing Sylkin overboard. Many years later she sees Sylkin again, only to be captured by her former friend (now powerful and vengeful sorceress). Sylkin is vengeful and can't wait to take out her anger on Iris. the scenario starts at this world's Black Market where Iris is overtaken by Sylkin and her goons.