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Keywords are:  'cleric spell expiation expiate'

Spell: expiation                Mana:  44  Wis: 35  Chr: 31  Lvl 36 Cler  (28%)
                                (helpful)   Requires: prayer for the dying and breath of life
                                Group: Cleric divine aid spellgroup

Usage:
cast expiation <target>

'Expiation' is a utility spell that a cleric casts on a target
that is grouped with him.  While under its duration, the magic of the
spell attempts to intercept damage to the target, transferring some
of the damage away from the target and toward the caster instead.  This
works with all incoming damage, be they physical attacks or magical
attacks, but it does not split damage caused from self-inflicted wounds

The caster has no defense and must rely on the target's defense.  If the
caster takes enough damage, he can die.  A caster can only expiate on
behalf of one other character at a time, although multiple casters may
expiate damage for the same character, and damage will be spread among
all of them.  Any such caster must be in the same room as the target for
the spell to work.

Unlike most targetted spells, the bulk of the magic remains with the
caster for its duration.  If a caster so affected wishes to expiate for
a different character, he can cast the spell on the new target without
penalty.  If the remaining duration of the spell is low, it can be
recast to extend its duration, either on the same target or a different
one at the caster's choosing.

Note that bonding in this way represents a godly commitment, and there
is no way for the target to avoid the spell's effect short of ungrouping
or leaving the area for the duration of the spell.  (Since this spell is
to the target's benefit, this is usually not an issue.)  The caster can
end the spell by casting it on himself.