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Keywords are:  'necromancer skill ritual enchant silence'

Skill: silence                  Lvl 35 Necr  (28%)
                                (obscure)   Requires: soulbind
                                Group: Necromancer Soulbind
                                Profession

Usage:
enchant <object> silence <soulstone>

The 'silence' enchanting ritual allows a necromancer to bind a black
soulstone to an item to silence it.  The freed soul covers most normal
noises, as well as either masking or consuming enchantments which
generate noise.  Some items may be too heavily enchanted to be
silenced.

Gold is required in addition to the soulstone.

This enchantment is permanent.