[quote=Freeshooter92]
But if you don't have a rune, there is no defense. And the common folk don't really have runes(At least I don't think so). Even a strong will matters little.
[/quote]

Yes but if you learn to create a effective warden in your mind to prevent entrance. Also once you realize it's a illusion then it would lose all it's meaning since it can't hurt you, beside Lucius made Psychomancy as more of a supporting magic then a purely offensive magic and likely to change to bring it slightly more into balance.