My father is Thor

The Nether Army is closing on Silvermoon City, and what its king wants is the Thunder Warhammer. Alan carries it. He is Thor's son, raised in the Lost Lands, and his father sent him to Silvermoon with the hammer and a silver betrothal ring to marry Princess Leia, who was promised to him when they were both children. His road goes through the Misty Forest, where he finds Nether soldiers set up in ambush for Princess Thea. He fights them off. He keeps his divine power hidden through it, which is what his father told him to do. Leia knows the army is coming and does not want Alan in the city when it arrives, so she has word given out that she is dead, and Alan is allowed three days in Silvermoon and nothing more. In those days he puts his hands on the Chosen-One Stone, which nobody has been able to break, and breaks it. Then the army reaches the city and he brings out the Thunder Warhammer and goes through their commanders with it. The Nether King sends a woman made up to look like Thea to take the hammer off him, and that comes apart, so the king comes to the siege himself, and Alan is badly hurt in the fighting.