Vanguard: Saga of Heroes was a high fantasy-themed massively multiplayer online role-playing game (MMORPG) developed by Sigil Games Online and published by Sony Online Entertainment (SOE). The game was released on January 30, 2007 and initially sold around 242,000 copies, while the number of active subscriptions was estimated to be around 130,000, to drop in the next months to about 40,000. On May 15, 2007, it was announced in a press release that Sony Online Entertainment had acquired key assets from Sigil Games Online, including all rights to Vanguard.

Daybreak Game Company LLC is an American video game developer based in San Diego. The company was founded in December 1997 as Sony Online Entertainment, a subsidiary of Sony Computer Entertainment, but was spun off to an independent investor in February 2015 and renamed Daybreak Game Company. On December 1, 2020, Daybreak Game Company entered into an agreement to be acquired by Enad Global 7.