usage: greatblow <player name>
-or-
       greatblow <monster> <x>
   
Greatblow is useful for killing weaklings or as a killing blow on a monster
that is almost dead. If you hit, you do double the amount of damage that you
would have done if you had simply "hit" the monster. The drawback being that
you are left vulnerable for return strikes.
  
Greatblowing costs more fatigue than hitting or parrying, so you may find
that it tires you out faster than you like if you over-use it.

Greatblowing subtracts two uses from your weapon instead of one.

Greatblow subtracts 20 from your armor class, down to a mimimum of AC 0. You
remain vulnerable until one of the following occurs to cancel your vulnerable
status:

1. You perform an attack
2. You are attacked
3. You leave the room
4. There aren't any monsters left in the room that you are attacking
   or have attacked.
