Headcanons ahead!  
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Life had never came easy to Discord. From the moment he was born, he was used and abused by his parents. This only worsened when his older cousin, Eris, came to visit.  
She HATED him. She despised that Discord was heir to the thrown and she wasn’t. She despised how weak she was in comparison to him. Everytime she came over for a “playdate” ended in Discord getting the short end of the stick. With every fiber of her being, Eris envied him. She wished she had what Discord loathed; power.  
One day, he and Eris were having one of their playdates… when Discord snapped. In an instant, Eris had vanished. Discord didn’t realize it at the time. All he wanted was to end this seemingly lifelong torment at the hands of his own family. He never meant to literally ☆POOF☆ Eris away.  
Her scream was the last thing Discord heard from her. It was so loud that everyone in the castle could hear it. Alarmed, his relatives came rushing in. The room was a disaster. Tapestries were ripped apart, paintings were torn to shreds, and the carpet had been marred.  
His uncle, Entropy, asked what was wrong, but baby Discord could only speak in incoherent sobs. Noticing that his daughter was missing, and seeing that the window had been shattered, Entropy concluded that it was those damn alicorns who took her away.  
Poor, poor Discord didn’t have any time to explain before his relatives stormed out of the room, already planning to declare war on their kidnappers. Where once they were civil, now was replaced with vengeance.  
How could Discord have known that his actions would have dire consequences…?  
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Probably my laziest one, drawing-wise.  
I should clarify that Discord is roughly 15 years old here (although he’s considered 3 by draconequus standards) while Eris is slightly older.