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Keywords are:  'necromancer spell deathly sleep'

Spell: deathly sleep            Mana:   8  Int: 27  Wis: 25  Lvl 27 Necr  (28%)
                                (helpful)   Requires: ironblood
                                Group: Necromancer Blood Skills
                                (Can Be Bloodcast)

Usage:
cast deathly sleep

This necromancer spell puts the body into a deep, regenerative sleep
from which waking is almost impossible.  Healing takes place very
rapidly while asleep, but the caster will be completely unable to
respond or defend themselves until the spell has expired or been
otherwise removed.

Few necromancers trust others enough to use this spell in public.