The final part of the Malazan book of the fallen series by Steven Erikson.
The Crippled God rules High House Chains and manipulates both its members and the rest of the world in an attempt to break free of his bonds. He is unique in that he is not King of his own House in the deck (that role falls to the cursed Rhulad Sengar), but is instead the Deathslayer, an Unaligned card. The Crippled God manifests himself in the form of a broken old man, continuously coughing, with mis-set bones and mangled hands, whose face is ever enshrouded by a hood and body by a shapeless blanket. His domain is a tiny, wandering Warren in the shape of a small tent (possibly a fragment of Kurald Emurlahn), which can isolate the area of a small island from the rest of the world. The Crippled God has a long and uncertain history of conflict and imprisonment with the Ascendants of the Malazan world, though they are apparently unable to kill him.
As of Dust of Dreams, however, it’s questionable whether or not The Crippled God is actually the major antagonist, or just another pawn in the war among the gods.