Need defense help

I am looking for some advice on my defensive team for alliance wars, purple tank required. Here is my defense.

Here are the other heroes that i have leveled. I am currently working on arial who can replace the healer in the defense.



I’d be tempted to replace Rigard with Kage myself. I generally prefer having heroes that can hit on the wings.

Try
Kage Rigs Posey Sesh Proto