Although it was ironic that his talking took longer than the actual ritual itself, that's mostly because everything was already prepared before they arrived.
As Ashton said, he had been working on a solution to get rid of curses for quite some time now. Yet it was only thanks to his new well of knowledge that the was finally able to formulate a concrete solution.
With the usage of Black Magic, White Magic, Nature Magic, and inspirations from Transmutation Magic, Ashton formulate the ritual that got rid of the curses that the invaders gave to Humanity since their arrival.
He did say that there is a possibility that this might not work for everybody but that's under the assumption of their curses being more complicated than he initially expected. Thankfully though, the overall results were optimal.
From this point onwards, Humanity will no longer suffer from Curses.
