In their warrior form, the astrids are muscular men with gilded armor and helmets shaped like owl heads. They carry a variety of weapons, like swords, spears, and knives. They had gleaming wings on their back.
Originally there were 96 who served as the Fairy King's elite guard, called the Knights of the Dawn. But in their arrogance, the astrids failed in their duty and the King was lost to Gorgrog. The Fairy Queen was extremely angry and hurt, so she took away their powers and cast them out. Six of them turned evil in anger but the rest remained loyal to the Queen and hoped to gain her forgiveness. They could no longer communicate with the Queen or the fairies, but still tried to watch over the Queen's interests.
In Rise of the Evening Star, when at her home, Kendra saw a golden owl with a human face through her window before she returned to Fablehaven. Seth also saw a large black owl when he hadn't drunk the milk, it could've potentially been an evil astrid.
In Secrets of the Dragon Sanctuary, at the Fairy Queen's Shrine in Wyrmroost, Kendra met the twelve that stayed around Wyrmroost. They shared their mind, and thought as one. Raxtus told her their story, and was able to communicate with them telepathically. Kendra tried to convince the Fairy Queen to have the astrids there assist her, but the Fairy Queen said she could not give the power back. However, she did remove the barrier preventing the astrids from communicating with the fairies, although the barrier between the astrids and the Fairy Queen remained. The astrids were thankful, and promised to assist Kendra in any way they could.
Two were able to fly into Thronis' mansion due to the defenses warding against perceived threats. They discovered that Seth and the others were alive and well, and Thronis planned to help them. Kendra climbed into the knapsack, and an astrid transported it to a safe place.
After getting the key, an astrid warned the group of an ambush at the rendezvous with Thronis' griffins. After Gavin revealed himself to be Navarog and took Kendra prisoner, the astrids flew to Kendra's rescue and subsequently three were slain by the dark dragon's sword, reducing the total number of the astrids to 93.
In Keys to the Demon Prison, at the shrine in Stony Vale, the Fairy Queen allowed the astrids to communicate with her once again. She also destroyed three of her shrines to give Kendra the power to restore the astrids to their former glory. Soon, Tanu and Warren began run preliminary investigations to track astrids, and the Fairy Queen tried to send astrids towards Kendra.
Three of the dark astrids turned back to the light, and the Fairy Queen gathered all 90 in her realm and sent them to Kendra at the shrine on Shoreless Isle. Kendra's kiss turns the astrids back into warriors. Twelve were assigned as guards to the shrine, two are assigned as bodyguards each to Kendra and Seth, and the rest of their friends each got one bodyguard. They take part in the great battle, eight falling, some slaying many demons before the final conflict is resolved.Dragonwatch, the astrids continued to work as soldiers and guards in the new fairy realm. They worked to expel the last of the demons.
- Crelang (Kendra's bodyguard)
- Denwin (Seth's second bodyguard)
- Gilgarol (captain of the astrids)
- Peredor (rebel astrid, Seth's bodyguard)
- Rostimus (Kendra's second bodyguard)
- Silvestrus (rebel astrid) - deceased
- Targoron (rebel astrid)