Image imported from derpibooru 
Original Description:
 
A little gift made by my friend idkhesoff, that i have got for my friend TheArtFox2468 ^^
 
Some gift art of this “Concorded” pony that she had on this pic here ^^  
(go check her out, her art is amazing and she is a very lovely person ^^)  
>>2838358p
 
TLDR: Concord is Discord’s brother who prefers Order to Chaos, and “conccorded” ponies basically get physically transformed to look the same (all white skin and hair, bright blue eyes) and become free of all “sin” and start treating him like a God.  
Ater his defeat, those who were Concorded where now freed, but would have white coloring on parts of their skin/hair, heterochromia, and sometimes psychological scarring/trauma.
 
This mare is one such example :3
 
Her name is Rose dust, and she was a pony that was quite sinful before she was concorded. She had stallion partner that was hopelessly in love with her, and instead of returning the feelings, she was very toxic. She constantly made fun of him and used him to spoil her silly with money and gifts, all while she cheated on him with various other stallions and mares.
 
When she got Concorded, she would lose all of her sinful qualities, and only focus on serving Concord and spreading his word. After his defeat, he reverted back to normal, only for her to come to the realisation of how horrible of a person she was, and hd a change of heart, getting rid of her old ways and committing fully towards her relationship to the stallion. They both settled down together, and had a little filly, named Snowy Falls. ;3
 
As of present,both of them re living happily together, with Rose being part of a group focusing on victims of Concord, and trying to help heal from their trauma.