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Keywords are:  'necromancer skill harvest bone'

Skill: harvest bone             Lvl 16 Necr  (42%)
                                (obscure)   Requires: corpsecutter
                                Group: Necromancer Undead Skills
                                Profession

This skill allows a necromancer to extract bones and bone shards from
fresh corpses.  The harvested bone will be properly cleaned, prepared,
and are primarily used to make druid spellstaffs.

Spellstaffs made of bone are able to cast some necromancer spells.