Journey into the Past is the introduction to the Ghost of Tsushima Iki Island DLC.
This quest serves as a partial "point of no return,” in that you will have to stay on Iki until finishing the DLC's main story, If there are any other quests, upgrades, or purchases on Tsushima you wish to complete, it is best to do so before traveling to the island. You will only be able to fast travel back to Tsushima after completing The Blessing of Death mission at the end of the DLC main story.
Synopsis[]
At an unknown time during or after the invasion of Tsushima, Jin Sakai hears about disturbing events happening at a small settlement named Drowned Man's Shore located in the southern Toyotama region and decides to investigate.
After arriving, Jin finds the peasants in the whole settlement have been driven into insanity by an unknown force. An investigation of a Mongol yurt nearby indicates to Jin that a previously unidentified tribe of Mongols were involved with whatever happened. A group of Mongol soldiers then appear, led by a shaman who declares to Jin that the "Eagle" is calling out for him before starting a shamanic chant. Jin fights off the Mongols, who have their combat abiltiies enhanced by the shamans. He speaks to a surviving shaman afterward, who tells him the Eagle will lead her Eagle Tribe to Tsushima's shores from Iki island before dying. Jin then remembers the childhood memory of his father's death.
Sometime later, Yuna arrives. Jin speaks to her about what happened, telling her that his father died on Iki before deciding to return there to investigate the Eagle Tribe's presence. Yuna stays behind to help the peasant settlement while Jin prepares for his journey ahead by talking to a boat captain by the shore that will take him to Iki.
The player at this point is warned that they are about to begin a long series of Tales that will challenge their skills as a warrior.
Whenever Jin is ready, he and his horse will board the boat, his first destination being the ancestral stronghold of Fort Sakai. The boat captain warns there have been severe storms around Iki ever since the Mongol invasion began, only they should be fine. Once they have set sail, Jin sights a large storm approaching, with lightning striking the boat afterwards.
Jin manages to survive the shipwreck, walking alone onto a beachside shore with the hope that his horse was alive too. After moving through a seaside cave, Jin finally reaches his destination of Iki island.