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When you boil fea to its bare bones it basically is an ideological conflict between Lucina and Chrom. Chrom, who would sacrifice the world for one person, and Lucina, who would kill someone for the world. Chrom, who believes in choices and bonds, who trusts and trusts and trusts despite all evidence that it's unwise, and Lucina, who believes in fate, who is getting increasingly desperate to find a way to destroy it. Chrom, who begs for you to live, and Lucina, who asks for you to die.