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Socinus wrote:
I was considering creating a weapon for a character that was a spear that could magically be lengthened or shortened depending on the needs of the user. So it could be a shortspear, a spear, or a longspear if commanded by the user.
What would I have to put on a weapon to achieve this effect?
The Fighter's Fork, from Ultimate Equipment, is basically exactly what you describe but with a pitchfork. It costs 7,315gp, if that helps.
Oh, and it's made using Shrink Item.