Talk:Princess Luna/@comment-25044778-20140714233155/@comment-25180484-20140715050447

Probably King Sombra cast a curse to gradually magnify her jealousy. I'd have said Tirek and his Rainbow of Darkness, except we've had our Tirek and his powers are nothing like his G1 counterpart

Also, the IDW comics kinda depict Nightmare Moon transformations/possessions differently from what Princess Twilight Sparkle would show