I have a question regarding Vorpal and the Warshaper ability, morphic immunities. Let's first look at Vorpal (SRD, emphasis mine):
Vorpal: This potent and feared ability allows the weapon to sever the heads of those it strikes. Upon a roll of natural 20 (followed by a successful roll to confirm the critical hit), the weapon severs the opponent’s head (if it has one) from its body. Some creatures, such as many aberrations and all oozes, have no heads. Others, such as golems and undead creatures other than vampires, are not affected by the loss of their heads. Most other creatures, however, die when their heads are cut off. A vorpal weapon must be a slashing weapon. (If you roll this property randomly for an inappropriate weapon, reroll.)
Strong necromancy and transmutation; CL 18th; Craft Magical Arms and Armor, circle of death, keen edge; Price +5 bonus.
Next, let's look at the Morphic Immunities ability from the warshaper (emphasis mine):
Morphic Immunities (Ex): A warshaper is adept at distributing her form's vital organs around her body to keep them safe from harm. Warshapers are immune to stunning and critical hits.
I have always read this as that a warshaper (or anything else with crit immunity) is immune to the vorpal effect, because the crit can not be confirmed.
However, my DM is claiming that even if you are crit immune you can still lose your head (based on the bolded part in the vorpal description). He reasons that if a skeleton can lose it's head, while being crit immune, then crit immune doesn't protect against vorpal.
Therefore, my questions:
- Is he over reading the (what I assume to be) fluff part of the description, or is he right?
- If he is right, would the bolded part of the Warshaper result in a headless (but still very much alive) Warshaper (by moving vital organs (brain)) into it's main body?