Walkthroughs for custom maps.

On Mephala, I went in with a sniper bow and a thousand Wizards (I spent a long time figuring out how to kill Styg, and only then realized that I could halve the Ifrit stacks with poison). I don't remember any other details, but I don't think there were any difficulties.

Added 1 minute ago
The Wizards, under the Frenzy effect, seemed to grind down everyone.