I have a questions about my idea. It's possible to clear main dungeon with Berserker, Mash and friends support?
Personally I think it depends. In JP once pass Camelot Mash's protection is critical for keeping Berserkers alive for me. Currently I've cleared almost all normal story quests with lv80 Mash, lv70 Kiyo, and mostly Merlin support for the extra buster performance for Kiyo's NP. I'm currently stuck in Agartha btw. But when it comes to before camelot you can pretty much clear anything using only your supports list.