Am i right to assume that an item to make you constantly use Detect magic will cost 8000 gp? It is 2000gp * 4 for permanent item in rounds (though it takes concentration up to 1 minute which will make it only *2)*2 for non slotted item (though adding it asanother option to another magiic item will make it only *1.5)*1CL*0.5spell level (as a cantrip). So it is 8000 or 3000 if you count it in minutes instead and just add it as an option to your robe of resistance. Am i right or omitted something?
Also can i make a guidance cantrip to bestow a permanent +1 competence bonus on attack rolls and saving throws? How should i price it then. Also a ring of at-will mending - how should i price it?
I hope I have the math right.
Ring of +1 attack + 1 save:
two parts. Save bonuses are listet so you don't use the cantrip to calculate. It is 1000x bonus squared. So 1000. To that you add a use activated guidance cantrip: 2000*1(CL)*0.5(spell level)*1.5 (additional effect)= 1500 So the ring would cost 2500 with both effects.
I would not allow that but that'S the math if I didn't forget something.
The at will ring of mending:
With a casterlevel of 1 it would cost 900gp for command word activated at will. But with CL 1 you can only mend objects of up to 1 pound and only magic items with a CL of 1.
Thanks a lot for really quick answers:) I forgot about mending high CL prerequisite to be useful:( I just don't really understand how should math and mechanics work in case of 1 round spell effect. An effect lasts for 1 round and requires 1 standart action the turn before to be active. So if i make it into an item which should cast it as at will or permanent - how should it be priced or if it shouldn't be allowed at all - because some effects are plain gamebreaking at low levels:)
OK. Now a question about permanent Detect Magic item again. You can make a cantrip permanent with permanency spell for 2500. And you can't use it on anyone else. But you can make an item with 0.5 (spell lvl)*1 (CL)*2000 (permanent item)*2(or4 for minute or round duration) and it gives me 2000 or 4000 depending on how to count a spell duration. Then it goes to 1.5 if i add it to another item or *2 if i make it slotless. Am i right in this one?
Re: detect magic item.
Since the spell description specifies concentration, the item could be use-activated (concentrate) instead of continuous (which also sidesteps the duration). So, the item (goggles of detect magic?) would have a market price of 1,000 gp; however, you don't really gain anything by making it use-activated, rather than command word (see Core Rulebook pg. 216 for spells with a duration of concentration), so a market price of 900 gp (0.5 x 1 x 1,800 gp) for an at will command word item is in line with hand of the mage.
If you're looking for an item that lets you "see" magic auras on a continuous basis, you need to use arcane sight as the base spell. Such a magic item would have a market price of 3 x 5 x 2,000 gp x 2 = 60,000 gp.
Re: guidance item.
The spell description specifies "a +1 competence bonus on a single attack roll, saving throw, or skill check." (emphasis mine) Duration is "1 minute or until discharged." (emphasis mine) It is not a continuous bonus; it only affects a single roll before being discharged.
For adding a continuous +1 competence bonus to attack rolls, use lesser bracers of archery as the nearest equivalent: 5,000 gp for a +1 with a single weapon group (see Core Rulebook pg. 56 or Ultimate Equipment pg. 47 for weapon groups). Applying to multiple weapon groups or all attacks should be more expensive (bracers of falcon's aim in Ultimate Equipment are hideously under-priced*, so I'm not using them as a basis).
A continuous +1 competence bonus to saving throws would follow the Save bonus (other) line in Table 15-29: Bonus squared x 2,000 gp. So, 2,000 gp.
Combining them into a single item uses the rules for Multiple Different Abilities (Core Rulebook pg. 549). So, an item that grants a +1 competence bonus to attack rolls with a single weapon group and a +1 competence bonus to saving throws would have a market price of 5,000 gp + (1.5 x 2,000 gp) = 8,000 gp.
*- +3 competence bonus to Perception would be 900 gp, +1 to all ranged attacks should be 10,000 gp (IMO), and the increased critical modifier for bows and crossbows I'd estimate at 12,000 gp (due to the existing restrictions); 12,000 gp + (1.5 x 10,000 gp) + (1.5 x 900 gp) = 18,350 gp.
Re: mending item.
A wand of mending has a market price of 325 gp per caster level for 50 charges. This would be the most inexspensive solution at low levels. A staff of mending would have a market price of 3,200 gp and would have 10 charges that would be "cast" at the user's caster level (if it's higher than the minimum CL 8 for a staff).