Edit: Not sure if this is intended to be a reference to a reference (since Chrom's line isn't quite a snowclone), so left a more literal translation.
Updated
I am the wings of despair. I am the breath of ruin. I am the fell dragon, Grim—Oy! The dragon of despair and ruin is dead!Who is it!? Who's the bastard who left the washtub in a place like this!?