Roseguardin
Saroknight is a boss monster in Dragon Quest IV. Saro hired or otherwise created him for the purpose of protecting Rosalee from anyone who managed to infiltrate the small fortress he built for her. The party must kill him to speak with Rosalee. Though just a palette swap of a regular knight enemy, he is significantly more powerful. Moreover, he uses the Ball of Silence, which Mara and Nara lost after losing to Keeleon, to prevent the party from casting spells. On the bright side, they win it back after their victory over him.