Hellblade: Senua's Sacrifice is a dark fantasy action-adventure game developed and published by Ninja Theory. Self-described as an "independent AAA game", it was created by a team of approximately twenty developers led by writer and director Tameem Antoniades. It was released worldwide for Microsoft Windows and PlayStation 4 in August 2017, with an Xbox One version in April 2018. The game features support for virtual reality, which was added in an update in 2018. Inspired by Norse mythology and Celtic culture, Hellblade follows Senua, a Pict warrior who must make her way to Helheim by defeating otherworldly entities and facing their challenges, in order to rescue the soul of her dead lover from the goddess Hela. In parallel, the game acts as a metaphor for the character's struggle with psychosis, as Senua, who suffers from the condition but believes it to be a curse, is haunted by an entity known as the "Darkness", voices in her head known as "Furies", and memories from her past. To properly represent psychosis, developers worked closely with neuroscientists, mental health specialists, and people suffering from the condition.