So currently there exists a bug where arcane spellcasters who take the Battle Caster feat and wear medium armour to suffer from arcane spell failure when using scrolls.
The description of the feat in game is identical to its source material in PNP 3.5.
Building on your existing training allows you to avoid the chance of arcane spell failure when you wear armor heavier than normal.
Prerequisite
Ability to ignore arcane spell failure chance from armor,
Benefit
You are able to wear armor one category heavier than you can normally wear while still avoiding the chance of arcane spell failure. For example, if you have the ability to normally wear light armor without incurring a chance of spell failure, you can wear medium armor and continue to cast spells as normal. This ability does not extend to shields, nor does it apply to spells gained from spellcasting classes other than the class that provides the ability to cast arcane spells while in armor.
In PNP scrolls are never subject to arcane spell failure, as per the 3.5 D&D FAQ which states:
"Is an armor-clad character who can use arcane scrolls
subject to the spell failure chance from armor when using
an arcane scroll? What about other magic items?
Arcane spell failure doesn’t apply when you’re activating a
magic item—not even a scroll."
On POTM currently, a class such as a warmage, warlock or a bard who takes the feat to wear medium armour will find themselves unable to use scrolls without the risk of wasting the scrolls.
The current workaround is to simply remove the armour, use the scroll and put the armour back on.
However this is both very tedious and breaks immersion by being cheesy. It also prevents the use of scrolls mid combat, and what NWN considers to be in and out of combat is very inconsistent.
One quick solution I can think of, would be to have the Armoured Caster feat disable Scroll ASF completely.
