Tempest of Swords and Shields is the fifteenth chapter of the Crimson Flower route Fire Emblem: Three Houses. This chapter takes place at the Monastery (West Hall) and contains the mission Protecting Garreg Mach.
With the former Leicester territories under Adrestian control, the Empire is now ready to face Faerghus. Hubert reports that Lord Arundel has headed to Derdriu and is collecting the Alliance's old Heroes' Relics, but Edelgard remains unconcerned. He further explains that the Kingdom will most likely surrender if Houses Blaiddyd, Fraldarius, Galatea, Gautier, and Charon are toppled. While House Rowe in the Fortress City of Arianrhod might be swayed to the Empire, Lord Rodrigue of House Fraldarius has already taken command of Arianrhod. Later that night, Byleth hears Edelgard scream. They find her in her room, and she sheepishly admits that she saw a rat and that she has feared rats ever since she was trapped in a rat-filled prison underneath the Imperial palace as a child. Byleth notices some papers on Edelgard's desk, and Edelgard panics and kicks them out of her room.
At the end of the month, Church soldiers personally commanded by Rhea march on Garreg Mach Monastery to recapture it. Edelgard orders Randolph and Ladislava to engage the enemy's main army while she personally defends the monastery from a detachment led by Seteth and Flayn. The Imperial forces emerge victorious on that front, and Seteth and Flayn are either driven off or killed. Afterward, Catherine reports on the battle to Rhea. If Seteth and Flayn survived, she receives a letter from Seteth explaining that he is deserting to protect Flayn, and resolves to crush the thief who stole her mother with her bare hands; if Seteth and Flayn died, she blames Byleth for taking everything from her and saying that no amount of repentance will his/her soul salvation and would be chained to the Valley of Torment and walk the desert until the skins rots from their bones and swears revenge on them in the name of the Nabateans. Meanwhile, a mortally wounded Randolph informs Edelgard that the forces that engaged Rhea were defeated and Ladislava is dead before perishing himself. Edelgard laments the amount of blood spilled in the name of her ambitions. Ferdinand reports that several lords of Faerghus have defected to the Empire as a result of the battle, much to his disgust. Edelgard, newly resolved, declares her intention to march through the Tailtean Plains to take Fhirdiad.
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