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2. Even on a failed save, you take half damage. If your total hp is below 0, by any amount, your dust (yes, I still disintegrate you even if you make your save and even if you would not otherwise be killed.)Perhaps you are thinking of another spell. 5d6 on failed disintegrate, nowhere near 'half'.
Yes, I was thinking other spells that reduce to half.
For purposes of this discussion: it's not relevant. Once I notice the creature is still active and continues to regenerate even after taking massive damage, I only need to inflict 1 point of damage to disintegrate it. After all, it's already below 0.
A creature or object that makes a successful Fortitude save is partially affected, taking only 5d6 points of damage. If this damage reduces the creature or object to 0 or fewer hit points, it is entirely disintegrated.
2. Even on a failed save, you take half damage. If your total hp is below 0, by any amount, your dust (yes, I still disintegrate you even if you make your save and even if you would not otherwise be killed.)Perhaps you are thinking of another spell. 5d6 on failed disintegrate, nowhere near 'half'.
Well if you somehow manage to have a caster level 5 when you cast it you could.
Specifically this could happen if you are a high enough wizard to cast the spell but have eaten enough negative levels to put your caster level at 5.
Deal damage equal to its Constitution score (after it hits 0). It will fall unconscious but not die. Regeneration rules + Diehard rules.
It would just be a troll with more hitpoints.
You're thinking about the 3.5 regeneration rules. I had to look it up myself, just in case I'd missed something.
Regeneration: A creature with this ability is difficult to kill. creatures with regeneration heal damage at a fixed rate, as with fast healing, but they cannot die as long as their regeneration is still functioning (although creatures with regeneration still fall unconscious when their hit points are below 0). Certain attack forms, typically fire and acid, cause a creature’s regeneration to stop functioning on the round following the attack. During this round, the creature does not heal any damage and can die normally.
Diehard doesn't say anything about falling unconscious at -(Con), just that you keep taking damage if you do anything strenuous and that if you reach -(Con) you immediately die. Regeneration says that you can't die from hit point damage while the regeneration is functioning. Since the rule in Diehard about dying at -(Con) is just restating the basic death rule, and the rule in Regeneration about falling unconscious is just restating the basic hit point rule, the exceptions from the rules apply.
On the other hand, neither Diehard nor Regeneration changes the rules about falling unconscious from non-lethal damage. If your non-lethal damage exceeds your maximum hit points-- not your current hit points-- you still fall unconscious regardless of the Diehard feat, and you still take lethal damage if someone keeps inflicting non-lethal damage.
The rules on non-lethal damage also state that creatures with Regeneration no longer take lethal damage when their non-lethal damage total exceeds their maximum hit points-- but that continuing non-lethal damage ensures that they stay unconscious longer. This is technically incorrect, because Regeneration restores non-lethal damage-- except from starvation, thirst, or suffocation-- at the same time and the same rate as it restores lethal damage.
So, a Troll with the Diehard feat will not fall unconscious from any amount of lethal damage inflicted upon it and won't take lethal damage from being repeatedly sapped after it's knocked unconscious. On the other hand, if it takes a single point of fire or acid damage while it's hit points are below -(Con), its regeneration stops working the following round and it immediately dies. On the third hand, it now has the ability to regenerate from any non-fatal amount of fire or acid damage-- starting in the second round in which it does not take fire or acid damage.
So if you're fighting a Troll with the Diehard feat, you can kill it with a pointy stick and a tindertwig, but if you want it to stop biting you first, you're going to need a sap. And once you have regeneration 1, it's better to obtain fast healing X than regeneration +X.