Pramas made the offer to publish the setting if Kenson would also create a superhero game system based on the d20 System. Kenson agreed and began work. Over time, it became clear to him that the game would need to be released only under the Open Game License. Releasing the game under the d20 Standard Trademark License, as originally planned, would have prohibited the inclusion of ability generation and character advancement rules. Presenting a complete game was seen as taking precedence over having a d20 logo on the product, so the decision was made to use the OGL without the d20 license.