Before this thread popped up, I wasn't aware of the Tarrasque preview. The thread raised a few issues and concerns with the legendary beast, so I looked it up. Its attacks are scary, but it felt "meh" to me, overall. Then iserith posted a neat idea, and I figured I'd run with it.
The Tarrasque certainly is big, but it doesn't feel big enough to me. A creature of that size would interact with the world in an unusual way, but nothing currently reflects that. As-is, it's just another creature to me, albeit one that takes up a lot of space on a grid.
I believe special creatures deserve special rules and special encounters. So I made a quick (relatively speaking) draft of an encounter which would use such rules. Hopefully, this could be refined into a template of sorts in the future.
The idea is to increase the scale of the battle. 5-foot increments won't cut it, and nor will the usual movement rules. The PCs are tiny next to the Tarrasque; they ought to interact with it in ways which aren't usual in normal combat. If the Tarrasque is meant to tear down cities, then a city shall be the place of engagement, including things you'd expect in one. This monster is nearly immovable and unstoppable; its stats should reflect that. Something as huge as this can't be viewed as a singular 50-by-70-foot block from the eyes of human-sized people; it has many moving parts. Taking down a behemoth this scary is a strategic and tactical challenge.
I want to create an encounter which properly reflects these concepts, but it is by no means an easy task. I know there are quite a few things which can be improved -- especially the more mathy parts -- therefore I'm sharing it so you can provide feedback and suggest ideas.
You can read the encounter here. Warning: it's roughly 4 pages long, pretty crunchy and probably could be better organized.
I like it!
I've given it just the one read-through so far, but it looks good on the first pass. I'll delve into it deeper later. Good work!
Oops, just realized the Tarrasque cannot fail the saving throw against the Wizards' Tower attack. I boosted its STs after writing that part and forgot. 
That's the first item up for correction.
iserith wrote:
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Mechagamera wrote: