Huh. I would've let them live in the 'real' world. You've killed the mane 6 so many times it would've been a twist in a meta sense. Plus it would've given us a unique subplot where they provide commentary on their own and each other's deaths, which could've been hilarious.

Piles of bodies are fun too.

Lol why does AJ always bite the dust first?

“Spike!” called out Rarity, “Stop your stupid comic from killing Applejack!”

“I’m gonna shove that mane right up your ass!” Spike screamed at Mane-iac, as if Mane-iac didn’t do that regularly to herself anyway.

“You are so grounded if you and at least one of us survive this!” screamed Twilight. “Hear that? Whoever lives, ground Spike!”

Why the fuck am I laughing at the parts that are funny or something I don’t know.

Back in the castle, the book glowed, and a limp form was ejected from the white light. Applejack slammed into the wall, slid down to the floor, then tumbled onto her back, her legs still shivering slightly, but very much a corpse. Her face was blue, sores on her neck where the tight rope had been, and her terror still frozen on her face. Her pussy and ass were distended, but there was none of Mane-iac’s cum or anything to tell whoever found the corpse who or what did this. It just lay on the floor, slowly cooling, perhaps just the bottom to an imminent corpse pile.

Game time started

Just an idea:I think it would have been better if they died in the comic book world, then live for a few seconds in their world and then die.That way, we could see their confidence falter when they realize that they would die in their world too.
For example:"AJ felt herself transported back, but something was wrong with her.She was badly hurt, but she didn't expect that her altercation with the Mane-iac would affect her outside the comic book world"After that, she hits her head, realizes she's in Ponyville, then dies.
And I think this also gives you the opportunity to use some dark humour, like:"Just as she faded, AJ's regret was that she didn't get to feel her brother's d*** one more time or to lick her sweet little sister"

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That is a good idea, which I'll likely use if I do a similar story in the future. Don't know if that will happen though sadly.