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Keywords are:  'thief skill bloodletting stab blstab'

Skill: bloodletting stab        Lvl  1 Thie  (28%)
                                (critical)   
                                Group: Thief melee fighting skills
                                
                                Speed: slow

Usage:
stab
stab <target>

The 'bloodletting stab' skill is a particularly brutal attack, that while
difficult to land, can be very damaging and painful.  The weapon is stabbed
into the target in an area so as to cause maximum damage, then ripped free
to open the wound and cause as much free bleeding as possible.  It may take
some time for the target to staunch the wound.

While daggers and spears can be used, it is also effective with any weapon
that has a blade. Only one-handed weapons can be twisted at the extreme
angles required to properly tear open a bleeding wound. Curiously, if you
are wearing gloves or gauntlets that have a bladed damage type, you can
also do a bloodletting stab while unarmed.

Bloodletting stab is most effective against living creatures. However,
elementals, undead and other creatures without blood in the convential
sense are still damaged by being stabbed and ripped into.

Because this skill uses special stances and aims for specific areas, the
target will begin to defend against repeated uses very quickly.  One can
typically only land this attack a small number of times in any given
battle.

Note that the free bleeding damage will not actually kill an opponent.