Yugiri gives you a medicine to prevent the soldiers from remembering what happened at the castrum.
Requirements
This quest is available if you have completed the quest The Will to Live.
Starting the Quest
Talk to Yugiri in Yanxia to begin the quest.
Gather Up the Imperial Decurion
Go north to where the orange arrow is pointing in the minimap. Check on the Imperial Decurion to proceed.
Find a Suitable Place for the Imperial Decurion
Go to the orange circle on the map and check on the sparkling Destination.
Use Yugiri's Medicine on the Imperial Decurion
Target the Imperial Decurion, and then you can either examine or target him and use Yugiri's medicine on him from the Key Items section of your inventory, or you can target him and use the icon to the right of the quest name in your list of active quests.
Gather Up the Imperial Soldier
Go north to where the orange arrow is pointing in the minimap. Check on the Imperial Soldier to proceed.
Find a Suitable Place for the Imperial Soldier
Go to the orange circle on the map and check on the sparkling Destination.
Use Yugiri's Medicine on the Imperial Soldier
Target the Imperial Soldier, and then you can either examine or target him and use Yugiri's medicine on him from the Key Items section of your inventory, or you can target him and use the icon to the right of the quest name in your list of active quests.
Search for Yugiri
Go west to where the orange arrow is pointing in the minimap. Go to the southwest edge of the orange circle and talk to Yugiri. There will be a cutscene.
Return with Yugiri
You can either teleport back to Namai, or go north to it on foot. Go north from the Namai Aetheryte and enter the pool of water. Go to the middle of the pool of water and dive underwater by pressing Ctrl+Spacebar on keyboard or by pressing B on Gamepad. Swim northwest through the underwater tunnel. At the end, hold the jump button to go up to the surface of the water. Go to the quest icon on the map and talk to Yugiri to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Gosetsu to accept the next quest: Path of No Return.