“Jace and Alec, in my opinion, have one of the best relationships on the show because it is a bond that is beyond love or physical attraction or friendship or whatever. It’s kind of a soul bond.
When we were exploring these characters, I looked into the origin of what a soulmate was and where that pretense came from…
It came from an old Greek proverb where human beings were created with two heads, four arms, and four legs, and the gods, fearing their power, split them all in two and sent them to different corners of the earth.
So those two people had the same soul but in two different bodies, and that’s where soulmates came from.
That’s kind of what Matt and I have tried to put into Jace and Alec’s relationship. They don’t necessarily have to say anything, they feel it through each other, and that can be hugely positive, but it can also be heartbreaking at times. You’ll see it later on. That relationship and that bond ends up being wonderful and hugely negative at the same time.”
— Dominic Sherwood (x)