#it's probably wrong

Ok, so how did we get here? Well, firstly, in The Ghosts of Antikythera. My first thought back than is that it was Sia. Sia makes some semblance of sense, in retrospect. She has massive beef with Kal (even more so than other people) and we know that her magic is powerful. HOWEVER we have not seen Sia using protection magic, meaning that we have no idea whether she even have the magic required to do such a thing.

Who does have protection magic definitely? Only Margaret and Dakkar. Dakkar is a possible candidate - seeing how he, much like most people, is not a fan of Kal and has powerful protection magic. But to me two things rule him out. Firstly, he doesn't have a connection to the Antikythera. It's possible that he just cast the spell and dipped out, but he references to the Antikythera as "the ship" in Arrival, part 2. Magic is a craft that requires a LOT out of you; if he put such effort into the Antikythera, he would care enough about her to at least say her name. Secondly, Kal says in episode 3 that "I haven’t encountered one of those since the war." Dakkar is present for those 45 between the war and the present. If this was really his spell, why won't he put it on more ships? Of course this one was special but enforcing protection against the evil fog is also pretty cool.

The second confirmed Protection user is Margaret. Margaret is POWERFUL. You don't call someone the "Great Enchantress" if her magic is not powerful. It's quite possible that she cast the spell that is guarding the Antikythera and than went off to New York. It makes sense because, unlike her brother, she was really missing for those 45 years. But, two things. A. We don't know what is Margaret's skill level in each of the Magic Ways. To me personally, the craft of spell casting is somewhat different than something like the Radiance. The raw magic is like energy you wield, much more instinctive and requires natural talent, but spells need someone to actually think and write and cast them while only using the Magic Way as a battery. That's why Itzal's spell was so powerful. You can't punch it. Anyway, back tracking to Margaret, we don't even know whether spells are something she did back than. B. It's less fun than my other thought. Margaret is by far the best options than Sia or Dakkar.

BUT HAVE YOU CONSIDERED TAAVI

My man spent a lot of time on the Antikythera, implied by what Kal, covered in illusion, says to Ahlaam. "We haven’t sailed the Antikythera together in many years." Yeah, it's possible Kal is bullshitting her to distract her, but Ahlaam agrees with him. Besides, it's likely that Kal knew these guys before it all and knows for a fact that Taavi and Ahlaam used to sail through Antikythera together.

We don't know anything about his Magic Ways, but guessing that Protection could be one of them is not that far fetched. We've seen weirder shit. AND we know that Taavi has been dead for at least 39 years, seeing as Sia says "Taavi’s been dead for years" so it's not news for Sia that Taavi is dead, meaning it happened before 1835.

at this point, it's just funnier Not To Know.