What, beyond correct elemental or alignment damage, can kill a regenerating creature?
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In pathfinder, disintegrate states that: Any creature reduced to 0 or fewer hit points by this spell is entirely disintegrated, leaving behind only a trace of fine dust. This indicates to me that that troll, Demon, Devil or whatever is GONE. I can see however, that not everyone seems to think so. What about the Finger of Death spell? It seems to only deal HP damage, 10/CL on a failed save, however, the rules state: Spells with the death descriptor directly attack a creature’s life force to cause immediate death, or to draw on the power of a dead or dying creature. The death ward spell protects against death effects, and some creature types are immune to death effects. Which seems to indicate that being reduced to 0 this way is certain death, but is there anything that confirms this...