John Call's page

As far as I've been reading the only monsters in the Bestiary that are immune to criticals are those that vorpal wouldn't affect anyway.

But both Dragons and the Tarrasque are not immune to critical hits according to the Bestiary, so would it be possible do decapitate them then?

There is no specifics about regeneration preventing vorpal - actually, the creature would not actually die, but would be reduced to 1 hp or something like that, like the tarrasque, but I'm not sure about it. Probably in a few rounds the monster would just put his head back in place and start attacking again. Either way, the only place in the book that says a creature would just come back after a death effect is the Tarrasque's version of Regeneration; So would it be possible to just go Highlander against trolls ans other regenerating things?

I've been thinking about getting a Vorpal sword to my 19th level fighter, but I'm not sure it will work the way I think it will.

The description of Vorpal in the book is as follows: "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."

There is no mention about creatures like Dragons, creatures Immune to critical hits, creatures immune to death effects and so on.

So, could I kill a dragon with a Vorpal strike? Or a tarrasque?