Bifrost is a 1-book series first released in 2017 with contributions by Olivier Girard, Alix E. Harrow, Caitlín R. Kiernan, Shirley Jackson, Shirley Jackson, Thomas Day, Guillaume Sorel, Pierre-Paul Durastanti, Rich Larson, Catherine Dufour, Greg Egan, Dan Simmons, Apophis and 16 others.