Upon reaching Hartschild, bring the kid to Commander Goodman’s house and watch the following scene. Chase after Egil; he’s found on the long stairway west of the inn. After the scenes, the party will spend the night. The next day, prepare to leave for the mines. Make sure to train at least two salve-makers (preferably up to LV8) as you’ll need them for the next major battle. When ready, head back to the lower floor of Mythril Mine.