Xiao style metallurgy is used by storing metal inside of a demi-plane. The plane has a the following properties

• Only Metal is allowed inside
  The exception is if there is a material attached specifically to a weapon it would remain inside of the demi plane
• The metal stored within the Demi plane can be crafted and molded however the wielder likes.

Changing the shape of metal is a lot more difficult than changing the shape of a metal within your demi plane.

Configuration of metal is still possible outside of the demi plane however it has limitations such as: It could not stop metal in motion and it could not form around an object.

 

Demi plane manipulation

Starting at level 3 you are granted the ability to absorb metal and summon stored metal as a bonus action.

You can absorb any metal you can touch that weighs 5 pounds of metal into your demi plane for use. Every two levels the limit of pounds your technique can absorb equals your current limit times two.

you are granted the ability to access your demi plane. As a bonus action, you may create a one way hole from your demi plane anywhere in a 5 feet space around you to summon any of your creations from within.

Weapon Modification.

At level 3, you will be able to modify any weapon inside your demi plane, magical or non magical by spending 1 minute concentrating on the form you wish it to take. Every two levels would take 10 seconds off of the timer.

The weapon that is modified keeps all magic enchantments that is on the weapon.

Once the form of the weapon has been changed the next attack you use has advantage as well as one of the following properties:

 

Chain retains form, cannot be used with a weapon with heavy

Gain 5 ft to your attack.

Guandao 1D10

For this turn only any creature entering your range can be attacked or knocked back.

Sword 1D8

Raise your AC by 1.

Dagger 1D4

Your movement speed is doubled. At level 11 your movement speed is tripled, this also provides a guaranteed sneak attack.

Greatsword 2D6

Reduce opponents AC by 1.

Halberd 1D10

If a creature is immobilized, restrained or on the ground, add a 1D6 to the next attack. At level 11 this changes to a 1D12.

 

Metal Manipulation

At level 7 you can shape metal by shooting some of your stored metals inside or by absorbing it to create an opening.

If a spot in armour was opened, a increase the chance of critical hit landing by 1.

If armour was turned into spikes, deal 1D6 damage 

Sharpened Blades.

By storing weapons they slowly sharpen themselves. After 6 hours weapons stored within your demi plane get +1. If they leave your demi plane for longer than an hour they revert back to normal. 

Metallurgy mastery.

Using your metallurgy is almost second nature at this point, gain a bonus action point.

Perfect demi plane control

Whilst in your demi plane, your control over metal is much greater, being able to change and shape metals at will, as well as gaining enhanced speed and power.

 

(W.I.P)