The people in my story's universe all have various magical powers, and if they want the effects of these powers to extend to their clothes or equipment, said equipment needs to be designed to a few specifications in order to comply with my world's method of "syncing" objects to their owners' aura, an invisible field that extends 3 inches out from every part of their body:
The object must at least be small enough that it can be encased completely inside its owner's aura for five minutes, to "sync" it. You can't sync anything too big to fit inside the aura when pressed against the human body. But once initially synced, this never has to be done again unless the object is significantly damaged or warped (or if the object is synced to a new person).
When you want to use it with your magic, the owner's aura must be touching at least part of the object to affect it.
For the purposes of the above two requirements, an "object" is defined as a solid collection of bonded atoms. A screw, for example, would be treated as one object, but if you're syncing a mousetrap, then the wooden board would be one object, the spring would be another, the metal loops attaching the spring to the board would be the third and fourth, etc.
The major takeaway from this is that if you want to be able to use certain types of magic properly, your weapon needs to be designed with as few pieces as possible, or, bare minimum, have all of the pieces be constantly within 3 inches of some part of your body while in use.
Now, this is pretty easy when it comes to swords, and not even out of line with how swords are already made. The blade, pommel, grip and guard all have at least some part of them that is within 3 inches of the user's hand at all times when in use. But when it comes to things like lances or halberds, there are going to need to be some major changes to their designs.
Real-life polearms were typically made with wooden hafts that then had the metal blade/point attached to the tip of them. This obviously means that the blade component of a normal polearm is too far away from the user's hand (or any other part of their body) for their aura to reach it. Ideally (at least for the purposes of use with magic and nothing else) a polearm, both the haft and the blade, would be made out of one uninterrupted piece of shaped metal.
But 1, this would limit the length of the polearm to roughly the user's height (see rule 1), and 2, my understanding is that polearms were designed the way they were because wood is both lighter and cheaper than metal, making a wooden-hafted polearm significantly more cost and energy efficient than one that was a single, long, solid piece of forged metal. But we're talking about being able to carry it with you when you do things like teleporting and walking through walls, so obviously some sacrifices to the ideal design would be worthwhile to take advantage of this. The only question is what those sacrifices would look like.
What is the best way to design a polearm for magic compatibility while making the fewest compromises to the advantages of the ideal real-life design?