In an upcoming mythic campaign one of my players asked whether he can craft/purchase a Cloak of Unearthly Grace, as the Nymph's supernatural ability:
Unearthly Grace (Su) A nymph adds her Charisma modifier as a racial bonus on all her saving throws, and as a deflection bonus to her Armor Class.
According to the guidlines for pricing custom magic items, I found that the cloak should be priced at 228,000 gold pieces. In order to simulate the Cha to save I have used continuous Bestow Grace, and for AC, Nereid's Grace:
Spell level 1, CL 18 (for maximum effect), duration 1round/level.
Cost = 1 × 18 × 2,000 × 4 = 144,000
Spell level 2, min CL 7, duration 1min/level.
Cost = 2 × 7 × 2,000 × 2(for duration) = 56,000
Two abilities on one item = cost of the most expensive component + 1.5 cost of the other component
Total cost for the cloak = 144,000 + 56,000 × 1.5 = 228,000 gold pieces.
I find the cost to be quite high for what it does, albeit fair. I thought about lifting the max Cha bonus to AC from the Nereid's Grace component so the player doesn't feel as if I shot down his idea.
For comparison: Cloak of Resistance 5 + Ring of Protection 5 = 25,000 + 50,000 = 75,000.
Campaign context: the campaign is going to be mythic adventures, very high powered. Also, I believe at one point all of the PCs will have at least 20 Charisma, with one of them optimizing Charisma to the roof (He is going to be playing an Oracle).
My question is as follows:
Is the price I came up with fair? Will it be fair if I lift the maximum bonus to AC from charisma?