OK, I want to make a full plate of armor that has both the abilities of Mithral Full plate($26,500) of speed and Plate of the Deep($24,650). I have broken down the cost below. I don't have the ability to forge this myself and neither does any of my party members, so I am stuck paying full price if I want it. Our GM lets us use our downtime to find specific magic items we want as long as we pay the full price for them.
Full Plate Armor ($1500)
Heavy Armor Mithral Cost ($9000)
+1 enhancement ($1000)
Deep Ability ($24,600-$1500(Full Plate Armor cost)-$1000(+1 enhancement cost) = $22,150)
Speed Ability ( 26,500-$1500(Full Plate Armor cost)-$1000(+1 enhancement cost)-$9000(Heavy Armor Mithral cost) = $15000 x 1.5(2nd ability cost to magic item) = $22,500)
Total Cost = $1500 + $9000 + $1000 + 22,150 + 22,500 = $56,150
If anyone can point out anything I did wrong or can give me a few pointers it would be appreciated.
You're forgetting masterwork quality. Every set of magical armor has to be masterwork, adding 150gp to the price. Edit: With the exception of mithral items as swordfalcon says.
Price
MWK Full Plate (1650gp)
Heavy Armor Mithral Cost (9000gp)
+1 (1000gp)
Deep Ability ((24650gp-1650gp-1000gp) = 22000gp)
Speed Ability ((26500gp-1500gp-1000gp-9000gp) = 15850gp x 1.5 = 22500gp)
Total Cost = 1650gp + 9000gp + 1000gp + 22000gp + 22500gp = 56150gp
Other than that one small error that barely made a difference at all in the price, you look pretty solid.
Edit: Good catch swordfalcon.
When you look up the rules for items made out of mithral it says this in the rules.
Cost: Weapons or armors fashioned from mithral are always masterwork items as well; the masterwork cost is included in the prices given below.
The $9000 Heavy Armor Mithral Cost has masterwork cost included into it.
Edit
And given this information I need to subtract $150(masterwork) form the total cost due to the plate armor of the deep portion because the armor will be made out of mithral anyway.
New total cost is $56,000
Thanks CampinCarl9127
Yup, forgot tr mithril in the last part as well. His number is right.