Fanfiction about the Mane Six often reflects the creativity of the fans. Some fanfictions might be set in alternate universes. For example, a steampunk universe where Twilight Sparkle is a brilliant inventor in a world full of gears and steam - powered machines. The Mane Six can also be given new powers or abilities in fanfiction. Pinkie Pie could have the power to manipulate time in a comical way. This not only adds an interesting twist to the stories but also shows how fans can take the basic characters and expand on them in unique and unexpected ways.
It might serve as a major source of conflict. The 'nightmare mane' could be terrorizing the wizarding world, forcing the characters to find ways to defeat or control it.
Twilight might become more strategic, learning from the battles she sees. Rainbow Dash could get more ideas for her own flying stunts. Pinkie Pie might use the excitement of the battles to come up with new party themes.
Well, without actually reading the 'mlp the mane 6 eatch death battle fanfiction', it's hard to say precisely. However, given the title, it might center around the adventures of the Mane 6 during a series of battles that could be life - threatening. It could also explore how their individual personalities and abilities come into play during these intense battles.