Weapons (the kind normally wielded by someone) that fight on their own without anyone wielding or otherwise controlling them.
Alternate names: Living weapons
Name variations: animated weapons
The first video game about Animate weapons was released on February 28, 1998.
Runic Games has published all these games
These can range from mystical weapons that have gained sentience, enchanted weapons that were somehow given it, weapons with integrated artificial intelligence (and some other features), spirits possessing inanimate objects and making them move, etc.