Love

History
the power of Love was one of the seven powers that created existence and it belonged to the sorcerer Orenia. this power was inherited by many noble advisers and match makers, who used its power to spread love throughout their universes. after a very long time, the power of Love fell into the possession of Cadance, who used it maintain love and purity throughout Equestria and the Crystal Empire. after she had Flurry Heart, the power was passed down and the young alicorn inherited it, which is part of the reason she was born an alicorn. Tirek possessed this power after he took it from Twilight, but he didn't use any of its emotional powers. the final user of this power was Dante, who lead a siege and battle against the heroes and their allies to get it from Flurry. it later fell back into the possession of Cadance, who began using it to fight the Shadow.

Purpose
the power of Love give people through out the universes the ability to care and feel for others. it can also allows beings to reproduce and retain the ability to have faith.

Users
Cadance: after she inherited the power, she used it to spread love and respect throughout Equestria and has used it to also combat dark forces. after she had Flurry, the power was passed down to her and Cadance lost the full magnitude of its abilities.

Flurry Heart: when she was born, she was the product of pure and unfettered love, which allowed her to inherited the power from her mother. while she wasn't able to use the full scope of its abilities due to her young age, she did possess immense magical power, which allowed her to evade Dante's capture for a few moments before he takes it. after Dante is defeated, he gives the power to Cadance.

Dante: after he stole it, begrudgingly, he didn't display any of its powers, since he immediately used it to summon Creation. he later returns it to Cadance and helps her master its powers, but he still possesses a residual piece of it, which allows him to resummon Creation.

Sunset: she undoubtedly possessed it when she attained Creation, but loses it when Dante takes her power.

Twilight: after the other princesses gave her their power, she gained Love, but didn't use any of its emotional powers. she did gain immense magical power, though.

Tirek: after he stole the power from the three princesses, he gained Love, but wasn't able to use its emotional powers. he did grow to titanic proportions after he gained it, though.