The true terror of the Tarrasque is not its stat block or abilities, nor is it its combat potential. No matter what you do, the Tarrasque won't stay dead. Even the wish spell cannot keep a Tarrasque dead for long. It will ALWAYS regenerate from the largest remaining piece of it, even if that piece is a sub-atomic particle. It may take days or weeks but it WILL regenerate. No god or magic weapon can truly kill the Tarrasque for good.
Also the Tarrasque's stomachs are the only things in the multiverse able to permanently kill gods and destroy artifacts. When you enter the Tarrasque's third stomach, you cease to exist, no magic, no divine intervention, nothing can save you or bring you back.
Tiamat, and even some CR 23+ creatures, can 1v1 crush the Tarrasque any time they fight, for the rest of eternity. But the Tarrasque only needs to win once, and they can't get rid of it.
The only thing that can permanently kill a Tarrasque, is another Tarrasque. That's why there is only one.
Also I'm pretty sure the Tarrasque doesn't care if you're immune to non-magical damage, if its stomach can erase gods and destroy MAGICAL artifacts that are typically INDESTRUCTIBLE, then there is no way you are surviving just because you're immune to non-magical damage.
In the 5e MM it says nothing about the tarrasque being immortal and its swallow attack doesn't say "Oh if you get swallowed you die" it says "Swallow. The tarrasque makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the tarrasque, and it takes 56 (16d6) acid damage at the start of each of the tarrasque's turns. If the tarrasque takes 60 damage or more on a single turn from a creature inside it, the tarrasque must succeed on a DC 30 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the tarrasque. If the tarrasque dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone." also Tiamat is immortal via "Discorporation. When Tiamat drops to 0 hit points or dies, her body is destroyed but her essence travels back to her domain in the Nine Hells, and she is unable to take physical form for a time."
Given a Tarrasque has a very long lifespan, is there any reason that one could not gain intelligence? After having spells cast against it, it starts thinking about spells and over the decades buried in its burrow it slowly gains some spell ability? Dragons have young to ancient stats so why would a Tarrasgue have a never changing statblock over a nearly immortal lifespan?
Given a Tarrasque has a very long lifespan, is there any reason that one could not gain intelligence? After having spells cast against it, it starts thinking about spells and over the decades buried in its burrow it slowly gains some spell ability? Dragons have young to ancient stats so why would a Tarrasgue have a never changing statblock over a nearly immortal lifespan?
Simply put: it's never had to. The tarrasque spends 99.99999999999999999999999% of it's time asleep and then wakes up and binge eats for a couple weeks all of the biomass in a given area before burrowing under the ground and sleeping off it's transfinite carbs.
can I use this as proof
where did you get that information? 1e
In the 5e MM it says nothing about the tarrasque being immortal and its swallow attack doesn't say "Oh if you get swallowed you die" it says "Swallow. The tarrasque makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the tarrasque, and it takes 56 (16d6) acid damage at the start of each of the tarrasque's turns. If the tarrasque takes 60 damage or more on a single turn from a creature inside it, the tarrasque must succeed on a DC 30 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the tarrasque. If the tarrasque dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone." also Tiamat is immortal via "Discorporation. When Tiamat drops to 0 hit points or dies, her body is destroyed but her essence travels back to her domain in the Nine Hells, and she is unable to take physical form for a time."
I like it but maybe add some extra psychic damage to the attacks other than tentacle.
Given a Tarrasque has a very long lifespan, is there any reason that one could not gain intelligence? After having spells cast against it, it starts thinking about spells and over the decades buried in its burrow it slowly gains some spell ability? Dragons have young to ancient stats so why would a Tarrasgue have a never changing statblock over a nearly immortal lifespan?
Simply put: it's never had to. The tarrasque spends 99.99999999999999999999999% of it's time asleep and then wakes up and binge eats for a couple weeks all of the biomass in a given area before burrowing under the ground and sleeping off it's transfinite carbs.
Also, the Tarrasque is pretty dim-witted.
Find your own truth, choose your enemies carefully, and never deal with a dragon.
"Canon" is what's factual to D&D lore. "Cannon" is what you're going to be shot with if you keep getting the word wrong.