Kill Loretta (Blue Spirit)

To complete this square you need to defeat Royal Knight Loretta (Blue Spirit), the boss of Carian Manor. Wait until the "ENEMY DEFEATED" or equivalent screen appears to mark the square.

Loretta is available to defeat without requiring killing any other boss, but it requires going rather far into Liurnia. Defeating Loretta gives the player access to the Three Sisters subregion in Liurnia, which features an Evergaol with an Onyx Lord boss. The square has synergy with Kill 5 bosses that ride a horse.

Loretta counts as a Liurnia boss.