>>16610985
>You can't just lose art/tech, that shit never happens.
The entire field of archeology and anthropology wants to have a chat with you.
Greek Fire's recipe hasn't been found yet either, all we have is really close approximations of what the real deal was too.
All it takes for art to be forgotten is losing access to whatever place it was placed at. If a city suffers a cataclysm or becomes inhabitable for some reason, nobody is gonna bring their murals and architecture along. Even regular small items won't come if they need space for food and other essentials.
Until they revisit that city, that's "lost art".
Tech is even easier, you just need to not train anyone else on how do something and have everyone that does know eventually die. I'm sure there's plenty of things we no longer know how to make because nobody bothered to learn them, often because we no longer need it.
>No one would ever let some powerful item be sealed, there's always someone powerhungry in your midst.
That's called the Player Character. :^)