Thus, at Grid's request for magical restraints, 'Water Clan King's Tears' to secure, Siren, since the reconstruction or Reidan, has been the place where Euphemina,... The first to discover Siren, has stayed.
Because of this, the initial discoverer of Siren, who stayed here from the time Reydan was being rebuilt to procure the magic catalyst 'Tears of the Beastfolk King' at Grid's request,... This place became a haven for Euphemina.
Euphemina has been staying in Siren since her initial discovery because of Grid's request to acquire "Tears of the Water Clan's King's Tears". That and the unique quests only she could get with her title "Friend of the water clan".