Lucans pact !Follow

ok i just got lucans pact spell at lvl 30.6, this spell should sacrifice some of my offense for deffense, give some extra resistance AND --> give un undead illusion !

well i didnt turn into an undead ! so is the spell actually liek this or is it a bug .. i mean when i examine the spell it says (undead form), or maybe they typed that by mistake .. well if anyone know about this issue please tell me.

thx !