Psychic Vampire
Psychometabolism
Level: Egoist 4, psychic warrior 4
Display: Mental
Manifesting Time: 1 standard
action
Range: Touch
Target: Creature touched
Duration: Instantaneous
Saving Throw: Fortitude negates
Power Resistance: Yes
Power Points: 7
This power shrouds your hand or
a natural weapon you possess with
darkness that you can use to drain an
opponent’s power.
If you manifest this power to affect
your hand, the next successful
melee touch attack you make (if the
victim fails its Fortitude save) drains 2
power points from your foe for every
manifester level you have. The drained
points simply dissipate. Your touch attack,
charged with psionic power, is
treated as an armed attack.
If you manifest this power to affect
a natural weapon you possess,
you must make a successful melee
attack with the weapon to gain the
power’s benefit.
Against a psionic being that has
no power points (such as a psionic
character with an empty power
point reserve) or a nonpsionic foe,
your attack instead deals 2 points of
Intelligence, Wisdom, or Charisma
damage (your choice).
The way I read it you're replacing 2 power points for 2 ability score damage.
Also I don't gain the points drained do I? They just are drained and thrown away.