"The mark on the forehead of each of the Alma Toran magicians is paint. During the arc, the mark isn’t there (wiped off) when they go to bed, and it’s there for the purpose of its outline to spread during battle and such (note: she could mean that the mark is there to mark the third eye)"
Looking at how staves wielders were the only ones who could produce the third eye, maybe the mark’s origins could be traced back to when the staves were created. The mark indeed wasn’t there in ch 223 when Arba invited Sheba to sleep beside her. It’s also worth noting that David and the twelve elders with him didn’t have the mark. Maybe the reason behind that will be explained in the upcoming guidebook? It also could be that Ohtaka forgot to draw them like she sometimes does with Kouen’s goatee and Gyokuen’s beaty spot that she adds later for the volume release.
Since the Alma Toran arc is still fresh in our minds, I thought about posting translation of Ohtaka’s blog entries about them that contain interesting facts.
"Whenever I’m drawing the metal vessel users, I think about things like ‘which one of them I’d want to follow, if it were just me.
Following Alibaba or Kouha doesn’t sound bad.”
If you pay attention to behind Alibaba and Hakuryuu, you’ll find the outlines of the other metal vessel users. I marked each one with their name. Some readers in the Japanese fandom think that the black circles on the faces of Sinbad, Kougyoku, Kouha and Hakuei could indicate that they either will fall into depravity or die. There are also white rukhs coming out of Koumei, Kouen and Muu. Another drawing of Ohtaka also had circles like those, but they were on Judar’s face, not Hakuei’s, so I wonder if we should read too much into them.
Back to this picture. Ohtaka seems to have drawn the future version of the king vessels and drew both Hakuryuu and Kouen as emperors, I hope it doesn’t hint that either Hakuryuu or Kouen will have to die in order for the other to ascend the throne