Place down the piece of Tarrasque flesh and cast the spell. When you have finished casting the spell but your blood or flesh on the piece of Tarrasque DNA. Very soon after that a Tarrasque will spawn, and you must make a saving throw of 19 + dex. On a failed save, the Tarrasque is wild, and will attack anyone like a normal Tarrasque. On a successful throw, you will have to do a d4.
On an odd number you will have general control over the Tarrasque, and you can issue commands such as go stand over there, or attack that creature. When it finishes your commands and it receives no more commands after d4 minutes the spell will end, and the Tarrasque will no longer be under your command.
On an even number you will have complete control over the Tarrasque, and it will do anything you say, even it that includes killing itself or some other command.
On either odd or even at any time you may dispel the Tarrasque, and it will leave you. It will not however, die, and may come back in the future.
* - (A piece of Tarrasque DNA, and some of your blood or flesh.)
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