
Generic Villain |
So here's the item:
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Robe of Black Vistas
Aura: Moderate conjuration; CL: 9th
Slot: Body; Price: ****** gp; Weight: 1 pound
This silken robe is colored at the bottom with the vibrant hues of sunset, yet as the eye travels upward, these colors darken to deep purple, finally culminating in a midnight black hood. If the wearer can cast summon monster spells, the wearer adds cerebric fungus to the 4th-level list of monsters he can summon with those spells, adds lunarma to the 5th-level list, adds ugothokra to the 6th-level list, adds yangethe to the 7th-level list, and adds neshmaal to the 9th-level list.
Requirements: Craft Wondrous Item, summon monster IV; Cost: ****** gp
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Any idea what it's price should be? I modeled it off of the various rings of natural attunement/summoning affinity from Advanced Class Guide. Some factors:
-It's a robe, not a ring. This should probably make it cost about 20% more than an equivalent ring.
-Unlike the assorted rings, the robe does NOT allow the wearer to cast summon monster III once per day. This should reduce its cost by... what, maybe 20%?
-Unlike the rings of summoning affinity, the robe allows its wearer to summon aberrations and plants in addition to outsiders. I'm not sure how much this should increase its price.
Anyone have any thoughts? I know I'm being real nitpicky trying to add up all these factors, and should probably just make it cost about 10,000 gp - comparable to the ring of natural summoning affinity (daemon), which adds far more options than my robe.

Generic Villain |
I wasn't really expecting anyone to answer this because the question's kind of weirdly complicated. Fortunately, after a little work I figured out the formula for those rings:
(levels of summoned creatures * 100) + (cost of single use/day spell)
For example, the ring of summoning affinity (angel) adds one creature to the 3rd-level summon monster list, one 7th-level creature, and one 8th-level creature. Added up, that's 18 levels worth of creatures, which equals 1,800 gp.
The ring also allows the use of summon monster III once per day. According to the magic item creation rules (pg. 550 of the Core Rulebook), that equals 5,400 gp.*
Add the two results together, and you get the ring's final cost of 7,200 gp.
*The formula for this is (1,800 gp * spell level [3] * caster level [5])/5.