Variable Length Spear?

[Socinus]

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?

[wraithstrike]

It would take GM Fiat. There is no game item that can do this.

[Doggan]

http://www.d20pfsrd.com/magic-items/magic-weapons#TOC-Transformative

That's the closest thing to what you're talking about. So like was said, GM Fiat, but at least you have a good starting point.

[Ryan Richter]

The closest thing I can find is the transformative property from the APG.
http://www.d20pfsrd.com/magic-items/magic-weapons#TOC-Transformative
But I'd probably lower the price since your reducing the overall versatility of the ability.

[redward]

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.

[Stiletto]

In The Magic Compendium 3.5 book there was a Changeling property that could only be applied to spears that could do that (among other things). Page 31.