I'm not sure about The Last Tide but Gravesong takes place in the same world with a side character from the main series being the protagonist. You meet this character in volume 7

Assassin's apprentice is a really nice intro book into the Realm of the Elderlings series highly recommend it

woah you like houseki no kuni i also forgot to put that on my interest list 😭

It would seem I have already accepted your request

hey wow what a coincidence that we would enjoy similar media