From the SRD, under Undead Type:
"Not at risk of death from massive damage, but when reduced to 0 hit points or less, it is immediately destroyed."
"Not affected by raise dead and reincarnate spells or abilities. Resurrection and true resurrection can affect undead creatures. These spells turn undead creatures back into the living creatures they were before becoming undead."
So the spells says they cannot affect undead but the undead type says the spells can. If the spells affect an undead creature as the above states and you destroy the undead by reducing it to 0 hit points then it is no longer an undead creature. Has the errata changed any of this? At work and don't have access to it at the moment.
"Not at risk of death from massive damage, but when reduced to 0 hit points or less, it is immediately destroyed."
"Not affected by raise dead and reincarnate spells or abilities. Resurrection and true resurrection can affect undead creatures. These spells turn undead creatures back into the living creatures they were before becoming undead."
So the spells says they cannot affect undead but the undead type says the spells can. If the spells affect an undead creature as the above states and you destroy the undead by reducing it to 0 hit points then it is no longer an undead creature. Has the errata changed any of this? At work and don't have access to it at the moment.