Conjure Tarrasque

You bring your arms up in the air and start the spell. Every hour, 200 hit points of prepared creatures are siphoned, starting from the lowest hitpointed of creatures up. If a creature should die in this way, their soul is destroyed, being obtainable only by a Wish spell. A creature prepared and being siphoned cannot move or regain hit points in any way. Once 1000 hit points are siphoned, any remaining victims are no longer considered prepared and must be recoated if they need to be used again. Then, a tarrasque is summoned 150 feet away in the direction the caster was facing at the time of completion. The tarrasque will not stop it's destruction unless defeated, or the 500 days passed. In either case, the tarrasque will evaporate, leaving nothing upon hitting the ground.