Can a magic user make a weapon for anyone to use? Specifically, a weapon that shrinks down to a pendant so that the non-magic person can carry it with them and call upon it at will.
"The strength of an enchanted item may be reduced by one to make it usable by someone other than the caster, such as a magically armored coat that anyone can wear." [YS 279]
To shrink a weapon would transform it from one size to another, so we must check "Transformation and Distruption" under Thaumaturgy [YS 282]. By the base description, it works via compelling "consequences" of the target. If we reference the basic rules on breaking things [YS 320] - "assume that an item has 2 stress boxes, modified by the item quality… most items do not suffer consequences" — if we can "take out" the item, we can assume that it has magically transformed from one form to another.
Let's assume that we had a Good(+3) Sword (4 stress boxes).
Enchanted item power:
- +5 power to takeout item (or +8 if we consider that the item can resist transformation by rolling its quality rating, but this is too complicated)
- +1 power to make usable by anyone else
This gives us Enchanted Item with +6 Effect.
So now we need a wizard to contribute his slots for this item who's able to place a +6 effect into 1-4 Enchanted Item slots [YS 287] giving us a size of "No smaller than Ring(ear or finger)".
How many slots will it cost an ordinary wizard? Great(+4) Lore wizard can pull this by exactly 4 Enchanted Item slots.
- 1 slot for +4 Effect
- 3 slot for +6 Effect
- 4 slot for +6 Effect usable by anyone else.
By default, this item can be used once a day to transform a ring-sized object into a Good Sword. If you want to use it more than one time a day, you have two routes:
- Practitioner can make additional use by taking one point of mental stress per use. [YS 280]
- Use a sword of lesser quality. This will make the sword less resistant to magical change, so the effect can be changed to permit more uses per day.
The easiest way to handle this is to have an item at character creation (the permanent kind that takes up 2 slots of gear as oppose to the consumable that takes 1) with that as a sole effect. Unfortunately I can't think of any way to do this from what I've read of the rules other than to spend a Refresh to be the bearer of the object, and unless it is bought with the next Milestone it will be inexplicably gone by the next adventure.