Noble Lady of Caelin

Noble Lady of Caelin (キアランの公女, Kiaran no Kimijo) is the fourth History Mode map unlocked by standard play. It is unlocked by completing Story Mode, as well as Together to the End.

Map Story Synopsis
Marth and Chrom have received word about the siege of Castle Caelin and has moved to help. Unknowing of this, Lyn seeks help from Caeda, who eventually finds help from Marth and Chrom. They then rendezvous with Lyn, with Chrom unaware of Lyn's heritage.

They then took the fight to Validar, freeing Castle Caelin of his evil.

After Castle Caelin was, Marth formally introduces Lyndis to Chrom. Lyn then decides to join Chrom.