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Keywords are:  'necromancer spell preservation preserve'

Spell: preservation             Mana:  16  Int: 18  Wis: 16  Lvl 10 Necr  (28%)
                                (important)   Requires: undead lore
                                Group: Necromancer Undead Skills

Usage:
cast preservation <object>

The 'preservation' spell retards the decay of corpses and some other
types of organic matter.  While the spell is in effect, the object will
not decay, nor will it be edible by scavengers.  When the spell wears off,
decay will continue. This spell is popular with necromancers, as it allows
more 'raw material' to be stockpiled.

Note that it will not work on inorganic materials, but it is effective
for prolonging the shelf life of food, such as butchered meat.