The Astraea Familia was an exploration type Familia that also acted as Orario's police force, dealing with people who were causing trouble. They were apparently well liked by the people as people like Karen Claes wish that they were still active. All members other than Ryuu Lion were killed in a trap by Evilus. Despite being unable to recover their bodies, Ryuu created a grave on the 18th floor, a place where her fellow members had joked that they wanted to be buried.
The Astraea Familia was considered to be a strong Familia. All eleven members were second class adventurers, they had reached the 41st Floor in the dungeon, and had killed Monster Rexes a total of 21 times. The Familia used to live in a home in southwestern Orario. It consisted only of female adventurers.