I thought about deathless, but a few traits made me hesitate...
Evil clerics can turn or destroy deathless creatures as good clerics turn or destroy undead. Good clerics and paladins can rebuke, command, or bolster deathless.
Deathless creatures gain the same benefits from consecrate and hallow spells as undead do by desecrate and unhallow spells, and they are hindered by desecrate and unhallow spells as undead are by consecrate and hallow.
Evil casters can be stunned by overwhelming auras of deathless creatures as good casters can be stunned by overwhelming undead auras. Use the "evil elemental or undead" line in the detect evil spell description when deathless are in the area of a detect good spell.
Deathless are healed by disrupt undead and damaged by unholy water as undead are damaged by holy water. Deathless are not affected by disrupting weapons. Spells that have greater than normal effect against undead creatures--including chill touch, magic stone, searing light, sunbeam, and wall of fire--do not have these enhanced effects against deathless creatures. Deathless take only 1d6 points of damage per two caster levels from searing light. Spells such as command undead, control undead, create undead, create greater undead, and halt undead do not affect or create deathless creatures.