Panacea said:This spell channels positive energy into a creature to wipe away its afflictions. It immediately ends any of the following conditions affecting the subject: blinded, confused, dazed, dazzled, deafened, diseased, exhausted, fatigued, frightened, nauseated, panicked, paralyzed, shaken, sickened, and stunned. It negates sleep effects and the effect of the feeblemind spell, and ends any additional effects from poison, as the neutralize poison spell. It also cures 1d8 points of damage + 1 point per caster level (maximum +20).
Panacea does not remove ability damage, negative levels, or permanently drained levels.
Used against an undead creature, panacea deals damage instead of curing the creature (which takes half damage if it makes a Will saving throw), but it has no other effect.
Revivify said:Revivify miraculously restores life to a recently deceased creature. However, the spell must be cast within 1 round of the victim's death. Before the soul of the deceased has completely left the body, this spell halts its journey while repairing somewhat the damage to the body. This spell functions like raise dead (PHB 268), except that the raised creature receives no level loss, no Constitution loss, and no loss of spells. The creature is only restored to -1 hit points (but is stable).
Breath of Life said:This spell cures 5d8 points of damage +1 point per caster level (maximum +25).
Unlike other spells that heal damage, breath of life can bring recently slain creatures back to life. If cast upon a creature that has died within 1 round, apply the healing from this spell to the creature. If this healing brings the creature up to –9 or fewer hit points, it comes back to life and stabilizes at its new hit point total. If the healing fails to bring the creature’s hit point total up past –10 hit points, the creature remains dead. Creatures brought back to life through breath of life gain a temporary negative level that lasts for 1 day.
Creatures slain by death effects cannot be saved by breath of life.
Like cure spells, breath of life deals damage to undead creatures rather than curing them.