Krystal found Adrastos' egg orphaned in an abandoned and destroyed nest, one she had been lead to by Verdalune; the unusual sphinx had honed in on the egg during a walk and refused to budge. Hoping beyond all hope that the egg was still alive, she rushed to get home and get the egg looked at. Thankfully the shell was undamaged and the chick still alive though it was touch and go for a while. It was a surprise to all who knew of the egg when he hatched as a royal, and the young harpia quickly became one of the prized birds of her and her fiancé's ranch and her personal stryx.

As he aged, it became quite obvious that Adrastos was going to be a big lad, and that is very much true. He's large, even by harpia standards. He's closer to a gryph in size. Something the royal is more than eager to use to his advantage while hunting and fishing, though it does become a hindrance in smaller spaces. It's not uncommon for him to come back from a flight with branches stuck in his feathers from where he tried to fly through dense trees. Much to Krystal's fond exasperation.

Adrastos is usually fairly kind and able to get along with most other stryx and people, and is surprisingly good at handling hatchlings and children. The chicks he tends to take under his wing, sometimes literally, and tries his best to teach them what he knows even if he isn't their sire. Krystal often puts him with orphaned chicks to make sure they have a good adult stryx influence. Despite his kind and patient nature he is very prideful and can have a nasty temper if pushed. A temper that can get violent, which considering his size can be very dangerous. He can also be rather mischievous and bratty, so it's not unusual for him to get into trouble. Or cause trouble for one of the workers or other stryx on the ranch. His favorite target is Aric, Krystal's fiancé, because he takes up Krystal's precious time and attention. Time and attention better spent on Adrastos, in the stryx's opinion.