Princess Twilight Sparkle created her own pocket dimension so that she could test spells to their full extent without causing any havoc around Equestria. It started small and barren, but grew into an entire world, a world where darkness reigns and lives are short-lived, and the Undead are eternal, a place where souls may mend your ailing mind.

This is a one shot I thought up after watching "Great Magic Barrier" by OnlyAfro. A crossover with Dark Souls.