Ki-Naga - By Bill Silvey

FREQUENCY: Very Rare
NO. APPEARING: 1
ARMOR CLASS: 0
MOVE: 6"
HIT DICE: 7
% IN LAIR: See Below
TREASURE TYPE: See Below
NO. OF ATTACKS: 2
DAMAGE/ATTACK: By Weapon
SPECIAL ATTACKS: See Below
SPECIAL DEFENSES: Nil
MAGIC RESISTANCE: Standard
INTELLIGENCE: Very
ALIGNMENT: Neutral Good
SIZE: L (10' long)
PSIONIC ABILITY: Nil 
Attack/Defense modes: Nil
LEVEL/X.P. VALUE: V/700+5 per hit point

The Ki-Naga is a rare type of Naga, and may indeed be the result of intermating between Naga and Human or Demihumans.  Unfortunately, the offspring of such pairings very closely resembles the dreaded Yuan-Ti to such an extent that only by getting close enough (within 30') to observe the Ki-Naga can any difference be told. 

The chief difference between the Ki-Naga and it's namesake parent is that the Ki-naga has the torso of a human (always female) and the lower body is serpentine.  The Ki-Naga takes on the mantle that it's forebear does, and guards valuable treasures; it is usually found guarding a large horde of treasure (Type A), or a single but very powerful magical Artifact.

The Ki-Naga is capable of wielding two weapons simultaneously with no penalty; it prefers scimitars, although it can use a bow effectively as well.  The Ki-Naga is also magically imbued with a powerful song that acts as a Sleep spell (q.v.).  If the area the Ki-Naga is watching over is inadvertently approached by unknowing persons, the Ki-Naga will usually hide (as a 7th level Thief) and use her powerful song ability to cause those who have stumbled on to her charge to fall into a deep slumber.  She then moves those effected as far away as she dares to go.  Those who persist in returning will recieve a stern warning, and further intrusion will be met with an attack.  

The Ki-Naga is half-female human/half-snake as noted above.