Meet Golden Mercy :3
 
She is a mythical pony that is out in the deserts and other areas with hot climates, who many people consider this “Goddess of Mercy” to be just an hallucination.  
The legend for her goes, if you are out in a hot area and find her, you will be granted a wish from her, as long as you write it down and attach it to her horns. Once you do that, her horns will glow, before she will disappear, and then the wish will be granted.
 
Not many people have seen or interacted with her, but from the alleged encounters with her, she is said to be a very kinid and friendly pony, who finds herself to be humbled when she is caught. She tries her best to be friendly with whoever sees her, before then having to leave after granting their wish.