u/ZeroRoyale

Hi, I was looking at a Gish build and came across something interesting

Fighters can take the alternate class feature Armored Savant at level one. Among other things, it halves the normal arcane spell failure chance

The spellsword prestige class decreases the AFC by a certain percentage as you level in it

My question is: which applies first? Halve it and then -10 or more? Or vice versa?