Gaiden said:
Caliban,
I would really like to read that smack. Could you post it?
The basic concept is simple, but the execution can be a little tricky.
Have a 20th level wizard collect about 50 stirges, and put them in a cage over a teleport circle. Use Dominate Monster over the course of a week or so to put them under your complete control. Use Discern Location to locate the Tarrasque, then Scry to pinpoint it, and then Teleport the entire flock of Stirges to it's location and have them attack.
The Tarrasque a Dex of 16 and Combat Reflexes, so it kill's 4 of them as they land on it. That leaves 46 stirges.
The Tarrasque has a touch AC of 5, so the Stirges only miss on a natural 1. Let's say 5 miss, leaving 41 stirges that have attached themselves.
The Tarrasque kills 6 of them on it's turn (because it has 6 attacks). That leaves 35 stirges attached on the 2nd round.
The stirges drain 35d4 points of Con. Even if they all roll a 1 on the Con drain, the tarrasque is now at 0 Con. Anything else would be dead, but the tarrasque is still technically at -10 hit points.
At this point the wizard goes through the Teleport Circle and dumps about 20 flasks of acid on the tarrasque (to make sure it's at -30) and then
Wishes it dead.
Cheesy, but workable in theory. (At least until the errata that required you to a certain amount of subdual damage to kill the tarrasque, but even then you just need a portable hole full of acid flasks to do the damage.)