Quote Originally Posted by Lauront View Post
Indeed. They had emphasised wanting to complete their plan on Zodiark before the crisis hit Amaurot. It's later specified in EW that it moved very rapidly. I believe a big part of that was because of where the fuel to summon him was going to come from and that the sacrifices were forced on them as a necessity given the depleted state of the star.
The text in EW makes it very clear that the sacrifices were made voluntarily.