Awaken Chaos Era | Friend System
You can get help from your friends to complete some of the difficult stages and earn easy rewards! You can use a friends hero everywhere except Trials.
Each account can have 50 friends. You can use each of your friends hero three times a day. That's 150 strong heroes you can use each day.
Makes sure to set your hero so your friends will be able to utilize them and remember to keep them geared. Click on your hero portrait in the top left, under Support Hero place the hero you'll share with your friends.
To unlock Asrina, use a friends level 60, well geared, fire hero to practically solo Tulpa 7.