True Love

True Love is one of the most powerful form of magic featured in Once Upon a Time in Middle-Earth.

Concept
True love was first identified as the most powerful magic by Daniel, who taught Regina the concept of love. It usually is in the form of a kiss.

Birth of Bilbo Baggins
Bungo Baggins and Belladonna Took marry each other out of love and have a son named Bilbo, who is born out of true love and has magic just like Emma Swan

Belle's True love kiss
Belle attempts to give Rumplestiltskin true love's kiss to get rid of the Darkness within him. However, Rumple chooses Black magic over Belle and releases her ("Skin Deep"

The Poisoned apple
Later, Snow White bites a poisoned apple to save her love, Prince Charming and all of her friends and allies. However, Regina does not hold her end of the deal and has Charming executed. However, Charming escapes and manages to accomplish Rumplestiltskin's task of taking the true love potion and putting it inside of Maleficent. When he comes to Snow and her allies, he finds that he is too late. Charming then begs one more goodbye, to which the dwarfs respond to yes.

As some practitioners of witchcraft can rip out another person's heart, those born as a product of true love have the power to resist such magic, such as Bilbo Baggins and Emma Swan ("Broken")

Emma as the new Dark One is the most powerful out of all of them because she was born out of true love as well. When Bilbo sees her ripping out Violet's heart, he threatens to warn her parents about it. However, Emma says she can't risk that, with Bilbo thinking she'll rip out his heart and says that she cannot take it because he has the same advantage as Emma has: true love magic. However, Emma turns the tides and instead takes his memory of what he just saw.

Individuals a product of true love

 * Faramir Took: His parents, Diamond of Long-Cleeve and Pippin Took had a true love and later have Faramir, who is a product of the true love.