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Keywords are:  'necromancer skill harvest teeth dragon'

Skill: harvest teeth            Lvl  2 Necr  (28%)
                                (critical)   
                                Group: Necromancer Dragontooth Skills

Usage:
harvest teeth <corpse>

This skill allows a necromancer to extract teeth suitable for
spellcasting from fresh corpses.  Undamaged teeth are often powerful
spell focii in the hands of an experienced caster, and have a number
of interesting properties.  It is also said that the teeth of dragons
are particularly powerful, and allow for different classes of spells.

Use the 'harvest' command to harvest teeth from fresh corpses.

You can see how many harvested teeth you have with the 'show teeth' command.

Note that when you harvest from the corpses of dragons or related
creatures, you will obtain dragon teeth instead of normal teeth.