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Message: <blockquote data-quote="Cheiromancer" data-source="post: 3158714" data-attributes="member: 141">Re: items of spell resistance.The mantle of spell resistance grants SR 21, and costs 90K.  The mantle of epic spell resistance grants SR 40 and costs 290K.  The official formula (DMG 285) is 10K per point above 12; the mantle of epic spell resistance is thus a bit off; it should only cost 280K.By the time you can afford an item worth 90,000 gp, SR 21 isn't very good.  The non-epic mantle is over-priced.  However the epic mantle gives great value against opponents of your spell level.  Extrapolating the price for even more epic value will give practically unbeatable SR for less than your headband of intellect +8 (SR 76 for 640K).  Now, this *might* be workable.  Items of death ward and mind blank make you immune to all kinds of spells; why not have an item that makes you, for all practical purposes, immune to everything that allows spell resistance?  I don't find this argument very compelling; ultra-high SR seems to have much greater utility than the official price.  And besides, most numerical benefits are scaled quadratically; the linear formula for SR is highly anomalous.I propose 3 alternatives involving squaring a value.  I will give them totally value-neutral names so you can't tell which one I favor:Option 1: mean and stingycost = (SR - 10) squared x 750 gp.This gives a value of 90,750 gp for SR 21, very close to the official value of the mantle of spell resistance.  The epic mantle's SR 40 comes in at 675,000 gp.  This price would make it a primary (25%) item at level 30, and it could have some use as a secondary item (10%) at level 41 (against non-epic opponents, say, or monsters with SLAs at caster level 20).  A SR 50 item would cost 1.2 Million; the major item for a 37th level character, perhaps.Option 2: insanely generouscost = (SR - 10) squared x 300 gp.This gives a value of 270,000 gp for SR 40, quite close to what the official formula would assign to the mantle of epic spell resistance.  The non-epic mantle would come in as 36,300.  It would compete with the +6 ability buff items to be a primary item around level 12, or a secondary item at level 16.  SR 50 would cost 480K, and would be a major item available at 27th level, but would still be useful as a secondary item at level 37.  Spell duels would have to involve spells that are not hindered by spell resistance.Option 3: fair and balancedcost = (SR - 10) squared x 500 gp.This option falls in between the other two.  SR 21 is 60,500 gp, about two thirds of the official price, and rather poor value for your money.  SR 40 would be 450,000 gp, about three halves of 290K, but not unreasonable.  SR 50 would cost 800K, and would be a potent major item for a 32nd level character.  Items this expensive might just be powerful enough to provide night-unbeatable SR.[edit]Other optionsYou could get all the disadvantages of the above formulas by using something like cost = SR squared x 200SR 21 would cost 88,200, which is too much; SR 50 would cost 500K, which is too little.  SR 40 would be 320K, which isn't bad.Changing the subtrahend might make a formula which is more balanced over all.  But a better alternative to using expressions like (SR - 15) squared (or whatever) would be to use an expression like the following:cost = SR x (SR - 10) squared x 15This would make SR 21 cost 36,300 gp, SR 40 would cost 540,000, and SR 50 would cost 1,200,000 gp.Such a formula could be fiddled with ad infinitum. For instance, if you wanted the low end to be a bit more expensive and the high end a little bit cheaper, you could trycost = SR squared x (SR - 10) x 10This would make SR 21 cost 48,510 gp, SR 40 would cost 480,000, and SR 50 would cost 1 million gp.And so on.  These formulas aren't really quadratic, though, so I'm not terribly keen on them.</blockquote>

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