I read the synopsis of volume 17 and liked the result. But I may not know some details. Sorry, I will be glad if you correct it.
First, a war game awaits us. And this means that the long-awaited replenishment may appear in the Hestia family! I think. (Because this author likes to repeat himself. Like a minotaur. And there will be more.)
It is expected to be Ryu. Her "duty" to Sire is no longer relevant, and only Bell is still dear to her. What about Anya Fromel? She has a similar problem. It can also be a good way to prove to your brother that she is worth something. This became possible thanks to the 17th volume. Or maybe someone else?
Secondly, I understand that Bell and Ryu will already be level 5.
And it looks like it's time to choose new aliases! If Ryu is not clear yet, and Hestia will be able to choose at will. But Bell, unfortunately, can establish a connection with Freya. For example, a favorite rabbit, Freya's rabbit, or a coveted rabbit. To tease Freya. Yes, this is not a combat alias. But Bell didn't have that. I think this disappointment will remain a disappointment. What do you think?
A new ability or skill may also appear. For Bell... He is a poor commander, but his mobility is hard to miss. He is a good duelist. For example, agile, evasive, or duelist. This is clearly a combat ability. While his "escape" is general or not combat, it seems. This is also not Bell's profit, he is already like that. Likewise with the "escape", he was activated on the third level and only learned about it on the fourth.
Third, the author hinted that Bell had six months left. If this is true, then the option that Bell will continue to explore the dungeon as before will not be enough. (Expedition of the Hestia family and allies.) Need to speed up. The choice is up to the xenos, Loki or Freya. (Freya told Ouranos that she would help with the dungeon.) But maybe it's time for the Ais Arc. For example, if Tsubaki advises to take an agronaut. Asking for at least one strongest magic sword. Which Welf will do and Bell will hand him over to Ryu. (Again, this will be symbolic. This means that the elf himself possesses the power from which the ancestors suffered.) Or it could be a guild quest to take Bell with you. Or as an "apology" for being forgotten due to Freya's influence.
I think it's time to stop there.