The Legend of Zelda: Breath of the Wild, mod inserts the contents of Hyrule Warriors: Age of Calamity
A modder, banan039, had fun inserting the contents of Hyrule Warriors: Age of Calamity into The Legend of Zelda: Breath of the Wild via mod, basically completing the game world.
With the mod installed, where usually in The Legend of Zelda: Breath of the Wild there are ruins and rubble, now there are laughing villages. Let's say that the atmosphere is not enriched that much. Indeed, the addition clashes a bit with the scenario. Take this mod as an excuse to return to the game, or to visit some places in Age of Calamity without having to kill thousands of enemies.
To download the mod, called Hyrule Rebuild Attempt, visit its official page. Please note that it is still in beta, so it is not yet final. The official description speaks of 260 new buildings complete with collisions, a restored Colosseum and areas not yet completed but fully playable.
Source
With the mod installed, where usually in The Legend of Zelda: Breath of the Wild there are ruins and rubble, now there are laughing villages. Let's say that the atmosphere is not enriched that much. Indeed, the addition clashes a bit with the scenario. Take this mod as an excuse to return to the game, or to visit some places in Age of Calamity without having to kill thousands of enemies.
To download the mod, called Hyrule Rebuild Attempt, visit its official page. Please note that it is still in beta, so it is not yet final. The official description speaks of 260 new buildings complete with collisions, a restored Colosseum and areas not yet completed but fully playable.
Source