This may seem like a strange thing to say but as someone who watched Laudna's journey in C3 it does seem like, unlike Laudna's, that Alex's planned character arc for Occtis is curing his hollow one status or making it more bearable. Alex said that Occtis loved food in his fireside chat and then in the first episode of the Seekers it is established that he cant taste. Sure, Alex at one point in the overview overture video said that Occtis is interested in his condition but I feel like that won't last now that he is learning about it.
Also, in this episode, Aranessa said "your current condition" referring to Occtis. That felt like foreshadowing.
i see three possible ways Occtis gets better.
Development of True Ressurection via studying the Stone of Nightsong.
Replacing his organs with ethereal organs via studying the bracer on Wulferic’s paw and copying the magic.
Creating an undead heart and putting it inside of him (a very minor fix compared to the other two)