kjenks said:
That Intelligence check is a good idea, but the DC seems a little too easy to me. I think the DC should be a bit higher, like DC 15 to recognize a spell that's being cast. And it should be a little harder for higher level spells, so let's add +1 per spell level.
It should be a little harder to identify a spell that’s already in place and in effect. Maybe we can make it so you must be able to see or detect the effects of the spell. Add 5 to the DC, so that would be something like DC 20 + spell level.
And it would take at least a little training -- say one rank in an appropriate skill -- to recognize a spell from someone sneezing. So let's make it "Trained Only."
Now, let's think, what should we call that skill?
How about Spellcraft? Yeah, that's the ticket!
What? There's already a skill exactly like that? Oh, well. Let's just use those rules instead of making up our own.
-- Ken Jenks
I see where you're going, but I want to get away from trying to identify the spell and know its a spell and understand the spell. This is about beings living in a magical world and knowing that the thoughts they remember are not their own. If I start using it based on the magic points put into it (I use the elements of magic system), then I skewer away from that and make it more of a magical investigation. He doesnt want to know the spell level, the magic in the area, what school the spell came from, who the spellcaster was, whom the spellcaster's first grade teacher is ect.; He wants to know what happened. He is trynig to figure out if something awry or is it just his paranoia.
This is a plain investigation. This guy is deducing what happened. Even when he finishes concluding he doesnt have to believe that something magical happened, but he does know that the actions he took were unlike him and he needs to correct it. Again, Charm is not a permanenet mind altering spell. Charm happens for a few hours and it goes away, completel... no residual back spell effects.
What I"m understanding from your arguement, is that a guard, no matter how good he is or smart he is, is too stupid to realize that he didn't know those people he let in an hour ago and that he doesn't normally act like that. If that is the case then EVERY castle, keep, inn in the d and d world would be raided on a regular basis simply using charm spells as the people would never remember what happened if they don't have spellcraft "not sure if i met too many fighters with this skill

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Again, charm spells are enemy makers. Any spell that someone has to make a will save on is an enemy maker if the person finds out they were under a spell. If the enemy can figure out that something is out of the ordinary, he's going to suspect some people. He doesnt need to know its magic to know something is wrong. Are all the detectives in your campaign magicians?
Take any other spell, outside of heals and such, they are pretty much bad if the opposite person has to take a save.
Intelligence and other ability checks are usually harder checks to make that skill checks because you only have the ability to work with.