Vorpal weapon is nasty. Not the insta-kill it used to be, but might as well...
Lvl 30 magic weapon. +6 enhan to hit and damage
Deals +1d12 per enhancement on a crit (so basically +6d12)
Whenever you roll the maximum result on any damage die for this weapon, roll that die again and add the additional result to the damage total. If a reroll results in another maximum damage result, roll it again and keep adding.
Also has a Daily Power that is a FREE Action...When you hit with the weapon, deal an extra 3d12 damage with the attack.