Sell your soul. Face your fear. End the world.
From the introduction:
Things lurk at the edges of the world, in the dark and twisted corners of humanity. Frightful things, horrible things, creatures that would steal your face, rip you apart, drop you into an endless void. And even all that is but a drop in the bucket beside the true horrors that lurk out there, ancient primaeval beings. The Powers, Fears, Entities, they have many names and many forms.
It is here, at the horror-laden edges of the world, where the stories of The Magnus Archive take place, and it is here where the MagnusDice game system tells tales. Players step into the role of one of the Marked, people who have been touched by an Entity, who draw power from those terrible beings, yet have not died and completed the transformation to being fully-fledged Avatars.
In less flowery terms, MagnusDice is a fan-created tabletop roleplaying system based on the work
and the world of The Magnus Archives. Players take on the role of characters touched by the Fears,
working to build up their cult’s Ritual to bring their Fear into reality.