This is just based on the spoilers I saw in IG as well, but:
Seth will leave to pay his respects to Salie, however Theo will take that opportunity to go back to Odea. Their child will be left in the care of the mage (forgot his name). Theo then will present himself to the King? or Prince? Calion was also there. He will also have a hard time while being pregnant because Seth is not with him.