Protection from Evil protects you only from SUMMONED demons. Other demons will attack you no matter whether you have cast the spell or not. Examples:
1. You are about to summon a demon. You will cast Protection from Evil first so that the demon will not attack you.
2. You suspect a mage nearby that he can summon a demon. The spell is a good idea. If the mage really summons a demon then the demon will not attack you. It can attack your (unprotected) enemies instead.
Moreover, the spell itself gives you bonuses to saving throws and inflict penalties to those that attack you even if there are no demons around. I am not sure whether the penalties apply only on evil alinged enemies. Therefore, casting Protection from Evil is always a good idea.
__________________
My name is Demon\'s Last Day. Yes, the last one.
|