Publication:Dread Codex/New Spells/Dirge of the Walking Dead

By means of this spell, you enable one living creature within range to continue to act normally even if its hit points have been reduced to 0 or below. If you are somehow rendered unable to sing (or pray for clerics), the spell is negated immediately.

When the spell is negated, the target does not suffer any additional damage, but immediately suffers the effects appropriate to its current hit point level (meaning, usually, that he is unconscious and slowly bleeding to death). If your target is reduced to -10 or fewer hit points, it dies immediately even if under the influence of this spell.