Madness Tarrasquekiller: Slaying the Tarrasque as a 1st level commoner.

[Jowgen]

The list of things that don't cost XP is specific and exhaustive. The list of things that do cost XP is not, and consists of "everything else".

This is correct.

it does not declare wish or miracle requiring XP to keep him down

This is also correct.

Does the specific-ness of the latter trump the general-ness of the prior? Surely there must be piece of RAW out there that resolves wheter the specific-trumps-general rule applies when a spell-application is referenced by something outside the spells description.

As to the question whether "undo auto-ressurect" is within the realm of a 4th or lower level spell... The Kiss of the Grave poison from the WotC Fey ariticle archives seems to be the closest thing to this effect, as it explcitly turns immortals mortal as its secondary effect, and can only be reversed with a miracle or wish. Surely one can draw a reasonable comparison from that.

Spoiler: Kiss of the Grave

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Kiss of the Grave Contact DC 20 1d4 Con Mortality* 5,000 gp
Crafting this poison also carries the prerequisites of Craft Wondrous Item and bestow curse. *The secondary damage causes immortal creatures, such as fey, to become mortal and renders all creatures unable to be raised or resurrected. The secondary damage is permanent and can be reversed only with a miracle or wish spell.

EDIT: Apologies to anyone who takes offence to being called Surely