Ultima was a bit flat as the big bad. The eikons all felt like stronger more layered antagonists who were interesting, wreaked havoc directly on Clive and the world. Barnabas would have been the better main villain. There's a good rule of show don't tell that was failed here, we were told Ultima was pulling the strings but we never saw the curtain pulled back to really see that in effect. And when it was hunted, Ultima just felt like a distant concept.
Nothing in Ultimas machinations were what was grieving the cast through most of the story