Should I ignore event banner? So I just learned that Daily Dungeon doesn't reset the reward, which makes the Mirror Gems is limited.

Right now I'm very comfortable with my Elize(me), Ix, Milla, and Rutee which wreck shits everytime.

The question is, should I ignore any event banner from now on and solely focus on Ix, Rutee, and probably Elize/Milla for later?