On an engineering, resources, and tactical level, vehicles constructed in primanoid or animalistic forms are significantly inefficient compared to wheeled or treaded purpose-built vehicles.
However, thanks to akashtech and the invention of chakra gears, these vehicles known as mechanical walkers ("mechwalker" or "mech" for short) allow their pilots to conduct their magical or martial powers through their mech, and scale their potency potency up in size.
In order to fully utilize a mech, a pilot must be able to wield supernatural powers, either as spells or martial techniques. Furthermore, they must mystically bond with their mech. The mech itself must be constructed with chakra gears located where they would normally be found on a body. The chakra gears must furthermore be connected with a chakra circuit that runs throughout the mech's body and connected to thebpilit's cockpit.