For an art trade this was~

The idea here is that Eris wants to tag along with Jack on one Halloween Night to evaluate his prankster skills, a notion he resents because, having found out that she is the Goddess of Chaos, he sees her as a rival of sorts. Of course, she insists on coming with him just the same :D (I like to think that after the initial annoyance, they take a liking to and develop a grudging respect for each other.)

I always thought that Jack and Eris would make an awesome team, couple, rivalry, or BFFs. They're both immortal and they both love to play pranks/cause chaos. They'd have a lot to talk about and a lot of fun times together I think ^^ As rivals, they'd also always be challenging each other to come up with better tactics to win out over the other. Whatever the relationship, Jack and Eris make a fun combination - therefore, it was no brainer to put them together in a pic~

Jack and Eris belong to Maxwell Atoms!