User blog comment:Daoneandonly747/Help with Harder Content Squad/@comment-24299339-20150811132526

As of now the main problem with your current team is your squad isn't getting the best out of your leader skill. Going for damage and survivability, you need one that benefits your entire team. I'm seeing Griel, Ultor, Tridon, Kira as potential leads. You could capitalise on units like Demios, Edea, Medina and Claire as they are more powerful subs.

Sefia can be replaced as lead with said leaders. Ruby in a way is a better alternative to Fiora. Sefia can be used as a sub still with the 30% bc drop. Edea and Shera are interchangable.

To battle harder content,  you need BB atk buffers (Lava, Zenia, Will etc.), Def buffers and ATK down inflicters (ruby/fiora etc.).