This is a side quest given by Turgoyn the historian on Sentinel Island. Turgoyn is looking for a way to obtain a journal of a legendary pirate located in a wrecked ship on top of a gnarled tree. The only way to get to it is to first complete the main quest line until you gain full access to your battle tower. Morph into a dragon, fly to the wrecked ship and morph back dropping your character onto the ship. You will find the Ancient Journal in a chest.
You have two choices. Either turn in the quest and recieve a no default/ one choice reward of exp. a blue item or a small amount of gold, or you can read the Ancient Journal yourself and gain two skill points.
This quest is a reference to the poem "The Rime of the Ancient Mariner" by Samuel Taylor Coleridge.