Scroll usage does not incur arcane spell failure. Only the inherent casting of arcane spells with somatic components does.Brain said:I'm not sure about when they use scrolls of arcane spells.
Your right.Shin Okada said:DMG P.238
"Using a scroll is like casting a spell for purposes of arcane spell failure chance (such as from armor)."
So Scroll usage DOES incur arcane spell failure.