Offer to become his host

From Create Your Own Story

You kneel before C'thulhu and say, "Great One of Azathoth! I praise your name! Enter my being so that the world may burn with your coming."

C'thulhu laughs. The blue gas orbs loses form and stretches, pouring itself into your nostrils, eyes, ears, and other orifices I don't feel comfortable mentioning. At first all is quiet. Then you feel your body start to change. You look at your hands and watch the skin flake off, revealing talons. Your neck stretches and you begin to grow fangs. Growling and laughing with glee you burst out of the house, reducing it to rubble. A small human attempts to shoot you with a laser baton, but dragons are laser-proof.

You growl and catch the human in your third set of mandibles, devouring him whole. You fly across the Halloween Dimension, burning castles and forests. You herald the end of the world and the coming of Shuggurat. Cultists and psychotics and New England goth kids offer blood sacrifice to you. And as your power grows, so does your hunger.

You devour the dimension you're in and escape across the multiverse. Finally, the Tourism Oversight Committee forms a desperate alliance with a thousand worlds across space and time. Though you consider them weak, they eventually trick you into a lesser form and seal you away behind Portal 676 for all time.

As eons pass, the TOC declares Portal 676 off-limits, so as not to risk releasing you. But you wait. You bide your time. Soon you shall rise again and blaze forth a new age of evil and chaos across the cosmos. You shall call upon your minions of Yuggoth and Succol. The cities beyond Aldebaran will send fleets of shuggoth and the multiverse shall burn when Shuggurat arrives to devour all creation and give birth to a new hell, filled with creatures forged in your image, by your blood.

In other words...THE END?