[aldiss2]

I foolishly ignored the multi armed critters,
happily you folks think of everything.

So here's more.

Seems the item bonuses stack

Again with our trusty Robe of Invuln for 80 earth gems

nataraja (0% Bonus) 80
nataraja w/ Dwarven Hammer (25% Bonus) 60
nataraja w/ Hammer of the Forge Lord (50% Bonus) 40
nataraja w/ HoF & DH (75% Bonus) 20
nataraja w/ HoF & Hammer of the Cyclops (100% Bonus) 16

That Last result looks interesting so I tried some more stuff at 100%
Dwarven Hammer/20/4
Marble Armor/10/2
Stinger/5/1

This seems to be telling us that the minimum is 20% of the base cost.

Moving on to "The Steel Ovens"

nataraja (0% Bonus) 64
nataraja w/ Dwarven Hammer (25% Bonus) 44
nataraja w/ Hammer of the Forge Lord (50% Bonus) 24
nataraja w/ HoF & DH (75% Bonus) 16
nataraja w/ HoF & Hammer of the Cyclops (100% Bonus) 16


After casting Forge of the Ancients

nataraja (0% Bonus) 40
nataraja w/ Dwarven Hammer (25% Bonus) 30
nataraja w/ Hammer of the Forge Lord (50% Bonus) 20
nataraja w/ HoF & DH (75% Bonus) 10
nataraja w/ HoF & Hammer of the Cyclops (100% Bonus) 8

some more stuff at 100% w/FoA
The Summit/40/4
Dwarven Hammer/20/2
Smasher/10/1
Stinger/5/0


On "The Steel Ovens"

nataraja (0% Bonus) 32
nataraja w/ Dwarven Hammer (25% Bonus) 22
nataraja w/ Hammer of the Forge Lord (50% Bonus) 12
nataraja w/ HoF & DH (75% Bonus) 8
nataraja w/ HoF & Hammer of the Cyclops (100% Bonus) 8

The numbers support the previous conclusion

1) If FoA is Active, BaseCost=BaseCost/2
2) Cost = [Base Cost]
- Caster Bonus (Intrinsic Bonus + Item Bonus) * Base Cost
- Site Bonus * Base Cost
3)MinimumCost=20% BaseCost
4) The actual cost you pay is the greater of the calculated Cost or the MinimumCost.


Note the minimum % is indeed 20% because when FoA is active we halve the BaseCost before we figure the other costs.

So how about checking the math and somebody restating it in an FAQ friendly way eh?