anyone have any idea what an item that increases the caster level for the purpose of overcoming spell resistance might go for? The only instance I can find of it is on the robe of the archmagi, and I can't gauge a value from that item. I'm thinking bonus squared x 2-3,000 is reasonable, but looking for a second (or third) opinion.
There's an ioun stone that increases your actual caster level by 1, I believe that's 30k.
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There's a feat called Spell Penetration, plus greater version. There are a very few magic items that do this, often as a minor part of a very expensive item.
If you allow any custom items like this, you need to be aware that you are either rendering all the existing methods obsolete (how much are 2 feats worth?) or you need to price them so they are truly exorbitant.
In 3.5, a feat was presumed to be worth a 10,000 item. Add 5,000 for each prerequisite it let you avoid.
While others have mentioned some items, I have a list of items that give a bonus to a class feature. None are for spell penetration, but I do have formulas that they seem to have used.
Here they are [L2 stands for level squared]:
Phylactery of Positive Channeling
Phylactery of Negative Channeling
creator must be a 10th-level cleric
= +4 levels for channel @ 11000 [=688*L2]
Headband of Havoc
rage
= +4 levels for rage power; imm use of rage @ 8000 [=500*L2; imm=4000]
Vambraces of the Tactician (Wrist Slot)
heroism
= +2 levels for challenge; 1/day imm expand area @ 8000 [=500*L2; 1/day=4000*1.5]
Coat, Resplendent Uniform (Body or Chest Slot)
heroism
= +4/+5 levels for tactician ability at expanded area @ 7000 [~350*L2]
Champion’s Banner (Slotless)
eagle's splendor, Knowledge (nobility) 5 ranks
= +4 levels for challenge @ 8000 [=500*L2]
Druid’s Vestments
polymorph or wild shape ability
= +2 levels for wild shape @ 3750 [~1000*L2]
Sash of the War Champion
cat's grace, remove fear
= +4 levels for armor training (-1 ACP, +1 max dex) and bravery (+1 save vs. fear) @ 4000 [save=1000; ACP=1000*1.5; MD=1000*1.5]
Gloves of Dueling
greater magic weapon
= +8 levels for weapon training; +4 CMD vs some @ 15000 [~1000*L2]
Bane Baldric
= +5 levels for bane and greater bane (=5 rounds of +2d6) @ 10000 [=2000*L2]
Robe, Monk’s
righteous might or transformation
= +5 levels for AC (1.25 AC) and unarmed damage (1.25); +4 levels for stunning fist @ 13000 [AC=2500*L2=~3900; D=1000*L2=~1600; 1/day SF=7500]
Necklace of Ki Serenity
calm emotions, owl’s wisdom
= +4 levels for ki pool and ki use @ 16000 [=1000*L2]
Bracelet, Silver Smite
align weapon, creator must be a paladin
= +4 levels for smite evil @ 16000 [=1000*L2]
Bracelet of Mercy
remove disease
= +4 levels for remove disease mercy or gain diseased mercy @ 15000 [~1000*L2]
Bracers of the Merciful Knight (Wrist Slot)
cure serious wounds, lesser restoration
= +4 levels for lay on hands use (2) and healing (2d6); 1/day bonus effect @ 15600 [1/day spell=400*1.5; rest=15000] [~1000*L2]
Bracers of the Avenging Knight (Wrist Slot) (Simply Superior to Silver Smite Bracelet)
bless weapon
= +4/+5 levels for smite or gain smite @ 11500 [~500*L2]
Champion’s Banner (Slotless)
eagle's splendor, Knowledge (nobility) 5 ranks
= +4 levels for challenge @ 8000 [=500*L2]
Robes of Arcane Heritage
speak with dead, creator must be a sorcerer
= +4 levels for bloodline power usable and effect @ 16000 [=1000*CL2]
Corset of Dire Witchcraft (Body Slot)
mage armor, creator must be a witch
= +2 levels for caster level one hex (= +1 DC); +4 AC @ 22000 [+4 AC = 16000; +2L = 4000*1.5] [=1000*CL2]
/cevah
You can get a price from the robe of the archmagi if you take into account the two 30% price decrease for class and alignment. It turns out as 20000 for the +2.
Edit: Even though it has a price, you should still hesitate about making an item like this. There's a reason only two items have this increase and you can't wear them both.
If you decide to make this item, you should make it so it doesn't stack with the bonus from the robe of the archmagi, since stacking wasn't taken into account with it.