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“It's my friend, sir. I fear she's walking into a terible trap! That scoundrel Cassius would never fight an honest duel. My husband took a similar stand against his tyranny not long ago. The brute took a girl hostage and then cut my husband down as he lowered his weapon! *Sniff* I can't let her suffer the same fate...”
—Maiden to Chrom
A Duel Disgraced (Stained Duel in the Japanese version) is Paralogue 8 of Fire Emblem: Awakening and is Kjelle's paralogue.
The following part of this article contains strategy; therefore, it is subjective, and may not work for everyone.
Because of the large number of Mages and Archers among the enemies, you should leave Knights and flying units behind. There are several sparkling spots, which you can trigger with units possessing high Movement. Mages are recommended to battle the Knights and General. Bring at least 2 Thieves to get the two chests in the side rooms.
Chrom and Sully should charge straight for the door at the top of the area, preferably equipped with ranged weapons. They will likely be attacked by the enemy carrying the Door Key, which you'll need to get to Kjelle. Sully can recruit her while Chrom battles the Archers besetting Kjelle. All other characters should focus on gathering items from the chests and event tiles, and either blocking the staircases, or if you'd rather gather EXP, standing beside them to take out enemies as they spawn.
Neither Kjelle nor Sully can likely defeat Cassius. If Chrom has promoted, he will almost certainly one-round-kill Cassius. Once that is done, mop up any remaining enemies and win the stage. Kjelle will converse with the widow villager and Sully, and C Supports will unlock for Sully and Kjelle's father.