Vorpal

Vorpal Attack
A vorpal attack is referred to a roll of a natural 20 (1d20), which is followed by a passing critical strike confirmation roll.

Some items may have a stacking effect which is produced in the event of a vorpal roll. (i.e. Vulkoor's Cunning, Shocking Blow on Charged Gauntlets, etc.)

Vorpal Weapon Effect
A vorpal weapon can instantly kill most kinds of creatures. On an attack roll of a natural 20 which is also confirmed as a critical hit, the enemy's "head is cut off". There is no special animation for this (aside from a blueish coloration)- the monster simply dies.

The following creatures are immune to vorpal (generally because they do not have a head, do not need a head to survive, or are immune to instant-death effects):
 * Undeads (except vampires)
 * Constructs (except warforged)
 * Red-named bosses
 * Beholders
 * Oozes
 * Also, the Deathblock and Deathward effects prevent vorpal. Fortification does not.

The vorpal property can only occur on slashing weapons, and is worth +5.