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Under information on BGG, it is notes that the board is modular. Looking at the video, the game itself looks like it takes place in the same arena. To me a modular board is a board like, Dust Tactics, Last Night on Earth, Claustrophobia, and Descent. Games where the tiles that make the board change from game to game. Did i miss something in the Kingdom Death video? Is the one main board the only arena the game takes place in?
Looking at the image at the bottom of the KS page (that shows lots of squares with the carved faces), and the brief line drawing of the arena near the end of the video (which shows the same squares with small faces and then a larger carved face) I'm wondering if "modular" means these are all individual tiles you just place side by side to form the play area. Mind you, it says on the KS info that the game board is meant to be 3' x 2' but the board shown is a lot smaller than that, so maybe there are a few variant regions (or maybe they're saving those for future expansions).