For 10 points, identify this novel whose titular protagonist has his arm ripped off by an unnamed Geat hero, a retelling of Beowulf written by John Gardner.
One character in this work is knocked out by a barrage of apples thrown by the protagonist.  Its protagonist pretends to be "the Destroyer" while sitting among a ring of statues and, while there, listens to a metaphysical theory laid out by the priest Ork. Near the beginning of this novel, the main character is wounded by a bull after passing through a pool of fire-snakes and becoming stuck in a tree. At its end, its protagonist tells a crowd of animals that he's "had an accident" and adds "So may you all." The nature of the songs sung by a blind harpist called "the Shaper" is explained to its protagonist by the omniscient, philosophizing Dragon; that protagonist spends most of this novel launching attacks against Hart. For 10 points, identify this novel whose titular protagonist has his arm ripped off by an unnamed Geat hero, a retelling of Beowulf written by John Gardner.
One character in this work is knocked out by a barrage of apples thrown by the protagonist.  
Grendel