So it does make it interesting, it means you’ve got a lot of moving parts. [One shift is] the De Dannan had three kings originally. I folded them into one. One of them is called Mac Cuill but I’ve basically taken one of the big heroes, Mac Cuill and made him the king of the De Dannan.

So things like that, I’ve done just because I don’t want it to be so complicated that it’s impenetrable for new readers. But hopefully people who love the material will enjoy it because they’ll have moments of, like, yes! I think it’s fun bringing these characters that I’ve had in my head for so long to life.

Characters like Cernunnos are interesting because there’s not really any great myths or stories that feature him, but we know of him from imagery, and we know what he stands for and what he represents. He’s almost like a force of nature, but he doesn’t have great associated stories.He’s not even really part of the Irish mythology, he’s a Celtic god as opposed to an Irish god. But again, he’s somebody I’ve wanted to tell a story with for so long, and he’s been a real joy. It’s funny as well with him, I couldn’t get him right. I’ve had him in my head for so long, and I couldn’t get him right. I was getting closer and closer to starting the book, and one day he came, and I was like “That’s him! I know him, that’s exactly how he looks and he’s always looked in my head.” It’s odd that sometimes it’s hard to find that personality.

You’ve written and drawn a book in the past, but this is the highest profile book that you’ve written and drawn at the same time. Has that changed how the ideas spring out of your head at all? Or are you trying to be deliberately methodical with your process to try and keep yourself organized as you’re writing it? How has that shift worked for you?

I plotted the entire thing out right at the beginning, so I knew exactly what the story beats were going to be. I made really sure that I was going to be able to tell a solid story. It’s got an end, of sorts. And I learned a lot from Greg in that working with him on Wonder Woman, just in the way that he broke down each issue into beats and page turns and double pages. I literally lay out each issue in my folders. I keep the icons really big, and I keep them side by side as spreads so that I know what it’s going to look like in a collected edition, because that kind of page-to-page beat and pace of the book is really important. And the way it ramps up, and the way it slowly speeds up towards a big conclusion.