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Keywords are:  'necromancer skill bloodsacrifice bsacrifice sacrifice'

Skill: blood sacrifice          Lvl  3 Necr  (42%)
                                (critical)   
                                Group: Necromancer Blood Skills

Usage:
bloodsac <corpse>
bsac <corpse>

This basic necromancer skill is the foundation of the necromancer 'blood'
skill group.  Before sacrificing the corpse to the gods, a necromancer
may sacrifice the blood, drawing power from the blood and giving mana
to the sacrificer.

Note that this implies there must be blood present.  Undead, elemental,
and a slew of other creatures have no blood, and you cannot perform a
blood sacrifice on those corpses.

In addition to restoring the magical powers of the sacrificer, a small
amount of health may also be obtained.  When in dire need, a blood
sacrifice may mean the difference between life and death.

You may also perform the sacrifice on behalf of another party.