I finished it as well and loved everything with all of the ending stuff. The story beat that really got me was a few levels earlier though:
Mastya? (the elephant fellow you teach how to sell things) trying to run to safety with a baby, simultaneously trying to keep them both calm so as not to turn into blasphemies had me agog, genuinely didn’t know what was going to happen there. Intense!
Ending spoiler: I was so sure one of the twins was going to die, like “die” die and I’m really glad I’m wrong. Maybe it’s a copout but I don’t care, let the scions live forever