>>543871487
honestly idk then, I ususalyl try to stack them on top of each other with Iris skill
it might also be the of enemies and their spread on 5-10. If you get dispersed long range mobs (like you do on the water arena) those are a pain to deal with
here's my chitose Cards if that helps
Also, I have Possitive signal lvl 3 on my set, that's a +62% flat ATK for 10 secons every time I cast Iris' skill