SMALL SPOILER! - - - - - - - So the dagger that her father gave her was actually a really...

SMALL SPOILER!
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So the dagger that her father gave her was actually a really powerful dagger that would be able to protect her but she took it the wrong way and k*lled herself, after that I’m pretty sure that the father goes on a rampage and kills the emperor

ALSO the emperor has a ring that helps control the duke so that’s why the duke is so obedient to the emperor