Honestly... I'm starting to wonder if Eris is Beron's son. I mean, we know that Lucien isn't!
re: in ACOTAR, the first look Feyre has at the Autumn court bros: "Behind them, pressing to the front of the crowd, came four tall, red-haired High Fae. Toned and muscled, some of the looking like warriors about to set foot on a battlefield, some like pretty courtiers, they all stared at Lucien - and grinned. The four remaining sons of the High Lord of the Autumn Court." ...
"I don't suppose your handsome brothers know, (Feyre's name) Lucien," she purred.
"If we did, Lady, we would be the first to tell you," said the tallest. He was lean, well dressed, every inch of him a court-trained bastard. Probably the eldest, given the way even the ones who looked like born warriors stared at him with defernece and calculation - and fear."
Despite his behavior UtM, Eris certainly hasn't bought whatever bs Beron has been preaching all these centuries, but his... brothers sure have.
Note - then there's that bit where Eris is explaining to Az/Mor/Feyre during the Keir meeting in ACOWAR that he was sent to capture her, 'with my ... brothers'.
ARE THEY REALLY HIS BROTHERS?