the conditions for releasing Combo:
1. Get Two heroes who could awaken the combo. example, Bu Lianshi and Savory, sent by the system, can awaken “Phoenix Charm”.
2. You have enough combo shard to synthesize a certain combo.
How to use Combo?
Go to Combo interface, you can put the Charm you want to use and you can click it in the battle. You will earn Combo points after your Heroes casting combos or spells. If you have enough combo points, click the Combo icon to use it. in Auto mode, the system would use Combo by default.