Dye Me Red and Crimson

[FE13] "Falchion's blade rings through the air with a single, clear chime as it slices clean through. For a sword forged from the tooth of Naga and made to cut through dragonscale, human flesh is nothing. " A gory AU where Robin succumbs to Grima, and Chrom goes to drastic measures. But in the end, they still love one another. Written for Sera.