Fire Emblem Echoes: Shadows of Valentia - Level 99 Boss Rematch [Hack]

Not content with the level of challenge provided in the main game, I decided to create my own high level challenge based off the fight with the Creation in the Thabes Labyrinth.
If you're interested and have Homebrew/CFW and/or some technical knowledge, you can attempt the challenge yourself using these files:
serenesforest....
Notes:
1. All player units are un-hacked. High stats are due to Dread Fighter loops, Pitchforks, Star Jacinths, Sacred Springs, stat-boosters etc.
2. All enemies are Level 99 with natural max/near-maxed stats. Some enemies have better equipment. Duma has Duma Moss because I was bored.
3. The battlefield music is from Duma's Ordeals, the Alm amiibo dungeon.
Strategy:
1. The biggest headache is the Creation who one-shots everyone no matter what. You will need to attack it outside of its range.
2. The Mogalls and Witches summoned by Jedah/Duma and Rinea are Level 99 and pretty dang annoying. Focus on defeating these summoners ASAP. Killing Duma kills all Mogalls, until Jedah summons more.
3. Rinea's Entrap has huge range and can potentially drag you into the Creation's attack range. Not only is this fatal, it will cause the Creation to start moving. Good luck.