D&D 5E Interesting items needed for Legend of Zelda type dungeons

[BigVanVader]

Hell, even locked doors requiring a key feel pretty railroady if the thief is 100% unable to lock pick them and the aforementioned sledgehammer has no effect.

Sure, which isn't a bad thing at all. Just don't have every single locked door require a key. Just the Big Important Doors. Not every block is indestructible, just the certain ones of a certain color.

 

[PnPgamer]

Also the walls with cracks contain secret areas. Use bomb to reveal them.