| Tandin |
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Honestly there is a relatively simple way to ensure that a Tarrasque remains dead, though getting it to there is still a challenge.
The basic theory behind this plan is that it is possible to kill a Tarrasque. The problem is that its doesn't stay dead. Specifically:
"No form of attack can suppress the tarrasque's regeneration—it regenerates even if disintegrated or slain by a death effect. If the tarrasque fails a save against an effect that would kill it instantly, it rises from death 3 rounds later with 1 hit point if no further damage is inflicted upon its remains. It can be banished or otherwise transported as a means to save a region, but the method to truly kill it has yet to be discovered."
Thus, it basically says that the only way to get rid of a tarrasque is to bind it or teleport it. The problem with this is that it can eventually return. However, there is an important piece of information to take note of.
"If the tarrasque fails a save against an effect that would kill it instantly, it rises from death 3 rounds later." This implies that while it doesn't stay dead it does in fact die.
Using this information and fulfilling the requirement of just killing it outright through constitution drain or another instant kill effect such as drowning, etc. At this point the tarrasque is "Dead" by pathfinder standards, though it will be back. However there is a spell that will prevent this.
Once the terrasque is dead but before it returns to life you can use the Soul Bind spell to capture its soul. The Soul Bind spell ignores spell resistance, and is automatically successful so long as the creature is dead and the gem used is valuable enough in this case at least 30000 gp. Once the tarrasque's soul is bound within the gem nothing, not even wish or miracle, is capable of reviving it. The only way to return it to life is to destroy the gem, at which point the normal rules for revival continue.
This may be a kind of holdover but it has two main advantages over the other methods.
1.) The terrasque is actually dead which means that you are going to be legendary.
2.) A gemstone is MUCH easier to hide, contain, and protect than a colossal killing machine. You can use various protection spells to prevent divination, evil individuals from taking it, etc. Also, it is much easier than creating demiplanes, etc. The hardest part is killing the terrasque. Thus this is a much more realistic way of killing it.