Quote Originally Posted by glass View Post
It's a rule. It cannot be false (blatantly or otherwise). It can be overridden by more specific rules, but otherwise it stands.
If you don't noticed, it's the "Dysfunctional Rules" thread - it's chock-full of false rules (blatantly or otherwise)
I mean - if you can explain how (or when) to make Leadership checks by RAW...

Quote Originally Posted by glass View Post
Sure it is. Because it says so.
No, it doesn't says so.
It says:
The tarrasque regenerates even if it fails a saving throw against a disintegrate spell or a death effect. If the tarrasque fails its save against a spell or effect that would kill it instantly (such as those mentioned above), the spell or effect instead deals nonlethal damage equal to the creature’s full normal hit points +10 (or 868 hp).
Suffocation is neither a spell, nor allow a save (which Tarrasque could fail in order for this rule to kick in)

There are numerous ways to kill the tarrasque without resorting to Wish/Miracle

For example, form-changing spells:
Arboreal Transformation (Complete Mage) and Touch of Juiblex (Book of Vile Darkness) are both turn their victims into plants ("a normal tree" and Green Slime respectively). After the transformation is finished - what's prevent us from burning it down (and, thus, killing the tarrasque without using Wish spell?)
Heck, even "simple" Baleful Polymorph may do it there (possible successful saves aside): once 24 hours is over - it's a little critter without any unusual abilities. After that, you can just stomp on it. (Or, you know, set it in a cage for it to die of old age in a few years - anyway, it would be dead)

Or, you know, Mind Switch - if Grim Psion successfully manifest it on the tarrasque, they would be in the tarrasque's body while keeping their respective class features, and the very 1st level of the class gives Undeath: no Con - no Regeneration, and no Regeneration - dead tarrasque