>>43418959I think anons "invincible" is meant as a hyperbole, but it should be noted It's possible for 4* Erika to reach 190 defense with only 8 energy with the sync grid. Combined with the +3 def from the buff and vigilance she should be quite hard to take down since Healing Sun 2 gives 1/8 Health I assume.
The wonderful thing is you can basically choose to max either defense or sp. defense depending on hall.