Thunder's Courage

Summary
Thunder's Courage is the sixth book in the series. The official descriptions states:

"Follow the valiant and powerful steed Thunder as he helps a young girl, Sevi Dahlstrom, find the courage to face the evil sorceress Boda who looms in Darkcomb Forest."

Balin
Balin is Sevi's gentle horse. He passed away before the beginning of the story due to a leg injury. Sevi misses him greatly.

Boda the Sorceress
Boda is an immortal sorceress who lives deep in the Darkcomb Woods. She wants to keep the Caregivers from ever returning, so she seeks to capture Sevi to keep her from ever making that choice. Boda also curses Cody for his "do-gooder" ways into a spider.

Cody Dahlstrom
Cody is Sevi's younger brother. He is very talented with horses, and his steed is Felix. He adores Sevi and follows her everywhere. Cody decides he wants to help his sister by bringing her spider silk, so he rides into the Darkcomb Forest with Felix. He is attacked by Boda's spiders and wrapped up in their webs, but Felix manages to run to safety. He is then cursed into a spider by Boda, but is rescued by his sister Sevi who breaks the enchantment by appealing to his humanity.

Felix
Felix is Cody's horse friend. They often go riding together, and Felix is extremely loyal to the young boy. Felix runs for help when Cody is captured.

Joani and Franz Dahlstrom
Joani and Franz are Cody and Sevi's parents. They own a clothing shop where they make their own clothing to sell. They are both supportive and loving parents to their children.

The Caregivers and the Wolf Riders
The Story of the Caregivers and Sara, including Mitka and Sigga as well as Feral and her wolf riders, and Sigga's demise, are mentioned briefly in this story as their own story is told to Sevi by Sevi's mother. Their story inspires her to become a caregiver herself.

Sevi Dahlstrom
Sevi is a young seamstress living on outskirts of Trail's End. In the story, she is approaching her coming of age when she will decide her profession. She is also mourning the loss of her horse, Balin. She can't decide if she will follow in her parents footsteps and work at their family shop, or if she should follow her heart and become a caregiver. She encounters Boda the Sorceress at her family shop, when the woman comes in asking if she makes clothes out of spider silk. Boda lures her to the forest with promises of wisdom and knowledge for her future, and the knowledge of how to weave spider silk. She rides into the forest with Felix and Cody, but they turn back after Sevi tells him that she wishes she had some spider silk to give her wisdom for her choices. The next day, Cody goes missing and Sevi realizes that he went into the forest to get spider silk for her, and she alongside several villagers go to rescue him. They battle together against spiders, until Sevi become separated and meets Thunder. Thunder inspires her to have courage like Sigga, and together they fight off Boda's spiders and enter her lair. They discover Cody has been turned into a spider, and Sevi is able to break off the curse by reminding him of his humanity and telling him how much she loves him. They escape Boda's cave and return to the village on Thunder. Sevi's coming of age ceremony is then rescheduled, and she announces that she will become both a caregiver and a seamstress.

Thunder
Thunder comes to Sevi's rescue in the Darkcomb Woods. He inspires Sevi to be brave like Sigga, and helps her to rescue Cody by fighting off Boda and her spiders.

Various Magical Creatures
A few magical creatures are mentioned in this story. This includes Boda's spiders and Wood Gnomes.

Various Villagers
A number of people in Sevi's village are mentioned by name. They include Maan Jakobs, the barber Mr. Onders, and the Steiger Twins, Trig and Willa. These villagers help Sevi to rescue Cody.