Ok, just one little problem with your logic...

Thrones, even that of the Celestian Empire, pass on to the next in line
when their current occupant dies. And even you must agree with me that
to become undead... one must first die. Thus Ladantine lost the throne
when he died and was brought back as his undead useless self. Her
Imperial Highness, Princess Marilynth, was the rightful Empress of
Celest when she did what she did and the only reason Celest fell was
because of the tensions between Hallifax and Gaudiguch that lead to
their current state and Serenwilde's decision to leave Celest to it's
fate.

The Celestian Empire is gone and I am of the opinion that it's time will
never come again. Celest may be the bastion of light for generations to
come, but it will never hold the sort of sway it once did. Even
Gaudiguch and Hallifax, if they returned, I am certain would not side
with New Celest. The best Celest can do is set the Basin to peace by
removing the Taint from Magnagora and helping the forests find peace
with each other and then withdraw into itself. Even I can admit the road
to hell is paved with good intentions. We all know that it was such that
released the Taint. Prehaps with our Elder Gods here, such a grave
mistake shall not happen again.

Of course, since our Elder Gods hate the ones in Magnagora, I do not
hold out much hope for peace anytime soon, even if the Taint was purged.

Penned by my hand on the 7th of Vestian, in the year 205 CE.