How would you adjudicate pricing this magical item?

[Zander Liteshadow]

So I have a character dual wielding bladesinger from prior editions with an insane weapon i'm trying to convert to pathfinder.

The character uses two weapon fighting (when not casting a spell as this was not a problem back in 2nd ed) with the following weapon:

Banshee: +3 Screaming, Dirge, Twinblade Bastard sword (back in the day the Complete Book of Elves had this cool bastard sword that non elves treated as longswords).

Twinblade was a property I created myself that allowed him to create a magical copy he could wield anytime he spoke a command word. the copy would disipate into nothing anytime the weapon was dropped.

Dirge was a property that I wrote that gave the caster a fear aura anytime he used the bladesong dance. I'm thinking of converting it to this:
Dirge (SU): Whenever a Spelldancer (magus archetype advanced race guide) activates the spell dance class ability, enemies within 30' must make a will save dc 10 + 1/2 Spelldancers class level + Spell dancers Charisma mod or become shaken.

Screaming is a +1 weapon property that adds 1d6 sonic damage

These days the Dagger of Doubling is the closest living relative to what I had back then and I'm happy with it.

If I take the Dagger of doubling and make it a bastard sword, then the base weapon would cost 5,335gp for a +1 bastardsword of doubling.

The Question then becomes, what enhancement bonus do I track Dirge at (+1 or +2), and how do I cost improvements to a Special Weapon?

Is it as simple as calculating a weapon with an enhancement of x(after figuring out dirge)-the cost of a +1 weapon + the cost of the Bastard sword of doubling, or do I treat them as an item with multiple similar abilities Higher of [(Cost of Enhancement +X)-(Cost of +1 Weapon)] & [Cost of Bastard Sword of Doubling] + 75% of the lesser value?

[Nickadeamous]

I think the pricing of the Dirge ability would also depend on how long they opposition is shaken for. If it's just 1 round, then I'd price it as a +1 enhancement. If longer than one round, I'd go higher.

Assuming Dirge is taken at a +1 cost, +1 for screaming, and the inherit +1 weapon bonus, it's at least a +3 weapon before factoring in the doubling aspect. Looking at the dagger of doubling, the doubling effects seems to cost 5,000gp, plus the cost of the mw bastard sword.

So I would see the +1 screaming dirge doubling bastard sword at around 23,502gp with the +3 version being around 55,502.

[Zander Liteshadow]

Dirge would last until they leave the radius or the dance ends (it lasts one minute per the class ability) so Probably I should cost it at +2. what method are you using to calculate those costs, can you break it down? Also keep in mind that the base doubling weapon already includes +1 at that 5k price so if you subtract that out its more like 3k for the raw ability.

[Dave Justus]

I don't really like your Dirge ability (mechanics, the flavor is awesome) in general I think that something that tied to a class ability and that has a scaling save based on the user shouldn't really be a weapon property. As written it would be a pretty cool arcana. Given that I don't think the mechanics are 'right' that is hard to price.

Sonic is more powerful than other elemental forms because of the very few resistances to it. In previous versions, additional sonic (and force) damage was 1d4 instead of 1d6 to reflect this, and I think that is a good call.

Doubling is also questionable. Getting a second +2 blade is obviously far more beneficial than getting a second +1 blade, and the pricing should reflect that. A dagger of doubling costs 10,302, if we subtract 2,302, which would be the price of the weapon without doubling, the dagger of doubling's property is worth 8000 gp.

Doubling really does 2 things. It gives you a second weapon to wield AND it gives you swift or free recreations of that weapon to use it even more times when thrown. If we consider the swift/free action replacement as a flat 2000 gp benefit (probably fair) then the second copy of the blade, a property we can call twinning, would be worth an additional +1 (which would make it's cost scale appropriately as the base blade increased in power.) If you wanted to skip the swift/free action cost, it would require a standard action to double your blade.

So skipping the dirge, I would price a +3 screaming (with d4 damage) twinblade as a +5 weapon, plus an additional 2000 gp if you wanted to be able to twin your weapon as a swift/free action.

[Zander Liteshadow]

It looks like you're removing the cost of a +1 weapon from the dagger of doubling which leaves you with 8,000 as the price of doubling, even though mathematically it should be somewhat less because price wise it falls between a +2 & +3 weapon so to truely accurately price the ability we would need to calculate it as a ratio. for the sake of simplicity and because I believe that it will come out to be less i'm happy to price the ability as a +2 enhancement. If I follow your lead for the other abilities then it should be calculated as a +6 weapon not really a +5 with an extra 2k thrown on top.

Sonic: not sure where you get your precedent of a d4 from, can you site source? I can site Magic of Faerun, and Arms and Equipment Guide pricing sonic as a +1 enhancement at 1d6.

Dirge: If I compare this ability to mace of Terror, it should be adjusted to a 30' radius when drawn with a DC 12 to 16 static will save (rather than scaling like before and requiring Blade dance to trigger). This keeps it closer in line with an existing item property. Now mace of terror is priced at 38,552 less the cost of a +2 heavy mace $8,312 That leaves us with a cost of 30,240 that's roughly the cost of a +4 property that causes panicked. 2 steps above shaken. I think i'd be comfortable reducing that down to either a +2 or +1 cost. wwhich would put the final weapon in the neighborhood of a +7 or +8 weapon in total.

Either 98,335 or 128,335 which do you think would be better, I think I lean toward +7 with a fear DC of 16 since in addition to being a normal fear effect it would also be sonic so any creatures who are immune to sonic effect ignore that property.