Yes, but most of the spells have a penalty of -2 or -4, dont' they ?
So basicly I am safe unless some undead throw at me Greater malison, Doom and Spook and even then I fail only on rolls (-6 + 4 + 2 + 6 = 6) lower than 6.
Correct ?
Besides, my Cavalier is immune to fear so that's cool too.