[RPG] What’s the BAB for Spiritual Weapons created by Crown of Swords

You are largely correct.

When they introduced haunts in Rise of the Runelords, they were still somewhat supernatural and ill-defined, and were super fun and creepy. We all still fondly remember Foxglove Manor. As much of the 3.5/PF community is intolerant of anything that's not entirely mechanistic, however, when they re-did haunts for Pathfinder (RotR was 3.5e originally) they did them in extra lame form as basically a trap. The only way you'd know any of those things to get rid of them is usually to make an artificial Knowledge check, which makes no sense you'd somehow know that, but that's where it is. Now, the haunts we hit in Carrion Crown recently were a lot more boring. "Oh let me channel energy again! Wait, no cleric? They're invulnerable!"

When I run haunts, I do two things. One, I throw out the trap/CR/etc crap and treat it more organically like a real inexplicable haunted-house thing. Then, the way to get rid of it is to research, ask creepy old Varisian ladies, ask the gods... And allow things to affect it that aren't just a cleric channeling energy, but symbolically appropriate stuff that any PC can do. Of course this means that haunts need to be "big deals" and not side throwaway encounters. Rather than have each individual haunt be its "own trap" I just make the whole haunt basically one thing, where you'd need to dispense with the whole thing and not "the scary painting in area A8." Haunts can be super fun and engaging if you reject the whole "it's a CR appropriate trap" approach and think "I'm directing Poltergeist."

1. Your pricing of the small masterwork light repeating crossbow is correct.

   Your pricing of the continuous master’s touch is correct per the guidelines. As a DM, I might not be so sure I like that price, however.

   Your pricing of the at-will use-activated magic missile is correct. However, it would not fire missiles that deal 3d4+1 damage, as you seem to imply. It would instead fire three separate missiles that deal 1d4+1 damage each.

   You have a mistake when you add them together: firstly, you dropped the \$\times2\$ multiplier from the duration note on master’s touch: it should be \$10,000\text{ gp}+4000\text{ gp}\$, not \$+2000\text{ gp}\$. Moreover, you missed this note:

   Multiple Different Abilities

   Abilities such as an attack roll bonus or saving throw bonus and a spell-like function are not similar, and their values are simply added together to determine the cost. For items that do take up a space on a character’s body each additional power not only has no discount but instead has a 50% increase in price.

   For one weapon with two different effects, you need to pay half-again the cost of the continuous master’s touch. So the cost should be \$10,000\text{ gp} + \left(4000\text{ gp} \times 1.5\right) = 16,000\text{ gp}\$.

   Finally, Eberron Campaign Setting has a page (268, to be precise) on warforged components. It includes statements like

   A warforged component usually occupies the same space on the body that a magic item of the same kind normally would.

   Likewise, armbow specifies that it

   attaches to the arm of a warforged, completely covering the hand.

   So assuming that this item uses up your character’s hand like the armbow does, it should cost \$16,000\text{ gp}\$. If it does not,

   Components that do not occupy any space on the body cost twice what they would cost as ordinary magic items.

   Thus that would be \$16,000\text{ gp} \times 2 = 32,000\text{ gp}\$.

   Either way, the fact that the base cost is less than the price of the armbow, despite having significant extra features, suggests to me that your DM may very well dispute these prices. I would.

2. A magic weapon must have a +1 bonus on it before receiving any other special weapon properties. But you aren’t enhancing this as a weapon, you are treating it like a wondrous item. The rules don’t really cover this possibility; I would probably require the +1. But a +1 is all you need; after that, you’re free to put as much other magic on there as you want without needing a higher enhancement bonus (with the exception of the more powerful weapon augment crystals).

   Any enhancement bonus on the item would add to attack and damage, yes.

   For costing these, the fact that you’re adding features to a magic weapon means that you need to consider that 50% premium again. You have a \$10,000\text{ gp}\$ component (the magic missiles), a \$4000\text{ gp}\$ component (the master’s touch), and a \$2000\text{ gp}\$ component (the enhancement bonus, assuming you go with the minimum +1). The second and third each cost 50% extra because you’re combining them on one item. Like so:

   $$ 10,000\text{ gp} + \left(4000\text{ gp} \times 1.5\right) + \left(2000\text{ gp} \times 1.5\right) = 19,000\text{ gp} $$

   This adds onto the \$550\text{ gp}\$ cost of the base item, so your total is \$19,550\text{ gp}\$. Again, twice that if it’s not taking up your hand.