[MENTION=20005]Matthan[/MENTION], how's this for the magic engagement ring?
Hélène Leblanc's Engagement Ring
Ring, rare (requires attunement)
When Blaise fled his arranged engagement to Hélène Leblanc, he left an idealistic woman who, even if she did not love him yet, believed they one day could be happy. A woman of great devotion, Hélène prayed everyday for his safety at sea, imbuing her fervent prayers into a gold and silver engagement band for her fiancee. Even when she discovered Blaise's intention to flee, Hélène secreted the ring into his traveling bags with a note declaring that she would redeem his lost soul. Five years later, and Blaise does not know what became of the woman he jilted.
The ring grants Blaise immunity to all forms of possession. Additionally, when a creature attempts to possess him, Blaise can choose to momentarily lower his guard, allowing him to make an opposed Charisma check in an attempt to gain insight into the creature. If he succeeds, he learns the creature's name, type, alignment, and one other detail at the DM's discretion (usually about how its possession powers work). If he fails, Blaise takes 3 (1d6) psychic damage for each level or Hit Die the creature has greater than his own level (minimum 1d6 damage).
Curse of Fidelity. Blaise cannot remove the ring and any oath he swears functions as per the
geas spell, with the same consequences for reneging on his oath. Abandoning his marriage doesn't count, for story reasons.