Suppose a player readies an action to magic missile anyone attempting to cast another spell in the following round. Then an enemy tries to cast a spell from a scroll what happens?
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By contrast, spell completion items are treated like spells in combat and do provoke attacks of opportunity.
Spell Completion: This is the activation method for scrolls. A scroll is a spell that is mostly finished. The preparation is done for the caster, so no preparation time is needed beforehand as with normal spellcasting. All that's left to do is perform the finishing parts of the spellcasting (the final gestures, words, and so on). To use a spell completion item safely, a character must be of high enough level in the right class to cast the spell already. If he can't already cast the spell, there's a chance he'll make a mistake. Activating a spell completion item is a standard action (or the spell's casting time, whichever is longer) and provokes attacks of opportunity exactly as casting a spell does.
Taking the above two rules quotes together, scrolls *are* casting, so the prepared action should trigger. Scrolls even suffer from ASF and being disrupted (if you read the scroll section in magic items).
Suppose a player readies an action to magic missile anyone attempting to cast another spell in the following round. Then an enemy tries to cast a spell from a scroll what happens?
From the magic item section regarding scrolls:
Activating a scroll spell is subject to disruption just as casting a normally prepared spell would be. Using a scroll is like casting a spell for purposes of arcane spell failure chance.
So if you fail your concentration check after being struck by the Magic Missiles, the spell fizzles as normal.
EDIT: Ninja'd! :)
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And to clarify the DC would be:
10 + damage dealt + spell level
A more effective tactic (though cannot be used with Magic Missile) is to target the scroll if you know they use scrolls. Assuming you target the scroll they're usually pretty easy to destroy. Magic Missile doesn't work since it can't target objects.