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What about Green Slime? Has anyone thought of beating the Terrasque down to negative whatever and then throwing a boat load of Green Slime on the body? You could even use that Psychopomp to suppress it's regeneration while its body turns slowly to green slime.
Green Slime (CR 4): This dungeon peril is a dangerous variety of normal slime. Green slime devours flesh and organic materials on contact and is even capable of dissolving metal. Bright green, wet, and sticky, it clings to walls, floors, and ceilings in patches, reproducing as it consumes organic matter. It drops from walls and ceilings when it detects movement (and possible food) below.
A single 5-foot square of green slime deals 1d6 points of Constitution damage per round while it devours flesh. On the first round of contact, the slime can be scraped off a creature (destroying the scraping device), but after that it must be frozen, burned, or cut away (dealing damage to the victim as well). Anything that deals cold or fire damage, sunlight, or a remove disease spell destroys a patch of green slime. Against wood or metal, green slime deals 2d6 points of damage per round, ignoring metal's hardness but not that of wood. It does not harm stone.
Of course if the Terrasque just regenerates faster than the Slime can transform it you get a very pissed of Terrasque that is shedding massive gobs of Green slime...