>>536651009
>if I really need Cerydra?
How many eidolons on Phainon?
If less 2 then yes you should get Cerydra

>And if Dan is free is he worth leveling up and using?
Yes, with Phainon's talent, his shield gives you 45% dmg boost and his summon allows you to get the full buff from Sunday. So 80% instead of 30%