Arth | Fire Emblem Heroes - Tactics Drills: Grandmaster 15 (Spurred On) @arthogonal | Uploaded October 2018 | Updated October 2024, 11 hours ago.
As usual, you can probably sense what the solution is after a few tries, and that there is one critical step that you have to figure out. Here, it's how to get Jagen around the mountain to engage the sword knight.