Ah, The Prince of Fireflies.

He is also known as the Great Voyeur, the Watcher Over Lovers, and the Bleeder of Hearts.

The Faerie of Taeliana are incarnate stories, and the Archfey are the incarnations of the most powerful themes in stories. The Prince of Fireflies is love stories, no matter how they end.  As an archfey, he does things for his amusement and to further the stories he embodies. (There is a difference between the fae and the faerie, which will be gone over later.)

This includes imbuing people with powers to further the story, rather than to see it end prematurely. Once the story of the love affair is over, and it either ends or settles down, he loses interest, leaving the powers with his pacted warlock, because something might happen to make it interesting again later…

He appears as a dense cloud of fireflies, with a humanoid silhouetted against it, but no details of the figure can be seen. He sends advice or messages to his warlocks rarely, but when he does, it’s with a firefly to direct.

D&D Game Rules for the Prince of Fireflies

A Warlock of the Prince of Fireflies gains the Dancing Lights cantrip as a free Warlock spell.

The preferred Eldritch Talents for a Warlock of the Prince of Fireflies are Devil’s Sight, Eldritch Mind, Beguiling Influence, Mask of Many Faces, One with Shadows, Bewitching Whispers, Trickster’s Escape, Sculptor of Flesh, Ascendent Step, Master of Myriad Forms, Shroud of Shadow, Visions of Distant Realms, and Witch Sight.

Preferred spells include Sleep, Charm Person, Invisibility, Greater Invisibility, Dream and Seeming.

While some of those spells may seem adverse to the idea of love stories, they are fitting for people sneaking into their lover’s homes when it’s a forbidden love, or checking on them when far away.. at least to the Prince.

The Fae do not see things the way humans do.