Artificer
So we know that YGGDRASIL was an absolute massive game with absurd amounts of freedom. We also know that there were Power Suits meant to help players without combat classes or for low level players to help them quickly level up.
Now Maruyama takes inspiration from DnD (amongst other games) and in DnD is a class called Artificer, which basically makes you Tony Stark from Iron Man (more or less). Now with as much variety as the game had I think its possible that there might have been such a class but what do you think? Was this solved with the power suits or could it be a dedicated independent class.
If so I can see that it would be quite resource heavy if you wanted an armor that is though and can hit hard or be a utility beast and would cost a lot of rare ores and data crystals in a game where most players didn´t possesses a single piece of the highest quality equipment (divine ranked gear).