Iroas's Devotee

As a devotee of Iroas, you have earned his favor through victories won in his name. You can cast compelled duel with this trait a number of times equal to your Charisma modifier (minimum of once). You regain all expended uses when you finish a long rest. Charisma is your spellcasting ability for this spell.

(Publishing rules disallow this from being limited to compelled duel, see SRD vs PHB content, choose the spell from the limited list)