I have a player that wants to add “Ki Spells” to their quarterstaff.
Specifically Blood Crow Strike (though they expressed interest in more), where they spend a ki point to cast the spell.
Their logic/reasoning /argument to allow this are that the Mountain shaper’s Girdle is 25,000 gp (which is a +4 str belt & spend one ki point to cast the 4th lv spell stone shape.
Subtracting the cost of an equivalent +4 belt of giant’s strength (16,000gp).
That would be 9,000gp (4,500gp crafted) to add a ki powered 4th level spell.
What are your group thoughts on this, and what would you calculate the cost for spells Higher or lower to cast?
www.d20pfsrd.com/magic-items/wondrous-items/m-p/mountainshapers-girdle
Allowing custom spell is likely to be overpowered.
Mountain shaper’s Girdle itself is less attractive due to the spell given and the ki limitation, only monk can use it and I doubt they will buy it instead of use the money for something more flexible.
But if allow to customize the spell given, then the story is different, which mean I can choose from unlimited spell list. Eg, spend 1 ki point to cast a cure critical wound or a freedom of movement from cleric spell list, or a holy sword from paladin spell list.
So, from the aspect of balancing, a "specific" spell given in a magic item is not equivalent to "custom" spell. If want to custom ki spell, then either limit the spell list or/and give it a suitable cost.
Given the at Qinggong Monk can get Blood Crow Strike at 14th level as Ki Power for (2 ki points per casting) I done not have an issue with it. Would keep the 2x cost, given it is an offensive spell.
I would not allow free rein on spells that could be added though.
On top of Blood Crow Strike they want to (if approve) eventually add.
Fly 3rd Level Spell
Nondetection 3rd Level Spell
Emergency Force Sphere 4th Level Spell
Anti-Magic Field 6th level Spell