—Maiden to Chrom
Enemy units are Level 19. Enemies of these classes will spawn every other turn from the staircases. Enemies possess Steel and higher weapons.
The script for this Paralogue can be found here.
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.
Because of the large number of Mages and Archers among the enemies, you may not want to bring Knights and Aerial Units or, at least, leave them exposed. A thief is recommended to unlock the door separating Chrom's army from Kjelle and to unlock the chests in the map.
Chrom or Sully should charge straight for the door at the top of the area, preferably equipped with ranged weapons as well as a few extra units to clear off any stray enemies or to protect Kjelle from Archers once they approach her. They will likely be attacked by the enemy carrying the Door Key, which you can use to get to Kjelle if a thief is not brought onto the map. After Kjelle has been recruited you can either take down Cassius as soon as possible or you can take out the enemy reinforcements if you wish to grind levels.
Cassius is not much trouble to take down with a well trained army, but it is best not to engage him with Kjelle due to her likely low resistance. He will stay in the top left corner of the map so you can swarm him if necessary, especially on higher difficulties. After completing the chapter, Kjelle will unlock her C-Supports with Sully, her father, and Lucina or Morgan if they are her sister.
- While the dialogue after finishing the map, having recruited Kjelle, mentions her late mentor's wife giving her some sort of heirloom-like item, Kjelle does not receive any additional items after the battle if she survives.