Since the two-handed longsword is made of carbon steel, it should be wiped dry after each use and regularly treated with oil (e.g., Ballistol or camellia oil) to prevent rust. Any nicks in the blade should be smoothed with a file or sandpaper.
Regarding its suitability for HEMA or stage combat: The HEMA version of this sword has a 3 mm thick edge and a hardened steel blade that is flexible yet moderately stiff, featuring a folded tip, making it specifically designed for HEMA training and fencing techniques. Due to its more flexible blade and HEMA-specific safety features (such as the folded tip), it is less typical for classic stage combat than purely stage combat weapons, but it can be used for technical training depending on the rules.