AQ6 first clear reward is an ancient bracelet and you can get up to two platinum chests from them which can be either normal/ancient.
AQ7 first clear reward is a devil ring (the new type) and the drop rate for one platinum is very low, but drops normal/ancient/devil.
Devil Accessories were implemented Dec 2018 and more bonuses were added.
- Pride
- Crit Rate
- Evasion Rate
- Damage Cut
- Recovery Performance
on ATK/DEF/HP, Devil accessories can give up to 10% bonus on max level.
example: