Editing Tarrasque (section)

===(PF) How to Defeat The Tarrasque===
By tricking it into thinking you turned it into something harmless and mortal, like a squirrel. See, its regeneration is ''technically'' just another ability in its stat block. It even follows all the normal rules for special abilities, like specifically being extraordinary, so it still works in antimagic fields. So since Baleful Polymorph removes all extraordinary, supernatural, and spell-like abilities, that would include its regeneration, which would render it mortal. There's just one little catch. Baleful Polymorph only does that on the ''second'' save, and since the Tarrasque is immune to polymorph effects, it never even reaches that point.

Enter Baleful Shadow Transmutation. This spell does functionally the same thing as Baleful Polymorph, but puts the save in the opposite order. It doesn't matter if you're immune to polymorph effects, because the spell just starts off by tricking you into ''thinking'' you were polymorphed, causing you to lose all those abilities... like the Tarrasque's regeneration. Sure, you still need to overcome SR 36 and +12 Will, but that's comparatively easy.

* [[Android]]s and anyone with access to the Nanite Bloodline (which can be obtained via [[Sorcerer]], a bloodline granting archetype, the Eldritch Heritage feats, or variant multiclassing) have an ability called Nanite Surge that lets them, once per day, add their character level +3 to any roll, including spell resistance checks. This makes bypassing SR36 automatic at level 16+, and doable even earlier with more anti-SR effort. There's other ways around it, but ultimately spell resistance isn't a problem if you build for it.
* Boost the DC as high as you can. Ways to do this include
** By level 20, it's easy enough to have a solid 34 in your casting stat (18 base +5 levels +6 headband +5 tome = 34). This makes the base DC 22+spell level (typically 6 for BST).
** Heighten Spell lets it be a level 9 spell, increasing the DC by 3
** Spell Focus and Greater Spell Focus collectively increase the DC by +2

Now you just need the Tarrasque to fail a DC 33 Will save, and with a +12 bonus, that isn't looking too likely. It would need a natural 20 to pass. Conversely, you have at least a +20 to Will (+3 headband, +12 base, +5 resistance), so that DC 27 save against its frightful presence isn't looking too difficult.

Congratulations. You now have 24 hours to kill the Tarrasque, before it realizes you didn't actually turn it mortal.