Different-level instance strategies have different reward mechanisms.
After E~B-level dungeons are cleared, the person who kills the boss last will receive attribute bonuses based on the boss's characteristics. For example, the Three-headed Demon Electric Lion rewards strength, speed, agility, and thunder attribute bonuses.
E-level instances can only provide one attribute bonus, and which one you get depends on the killer's own quality conditions.
If you're a Thunder Attribute Elemental Master, you'll receive a Thunder Attribute bonus first; if you're a Strength Attribute Supporter, you'll receive a Strength Attribute bonus first.
But if you're like Qian Qi who is none of these, then it's up to random luck~
Fortunately, the strength attribute of this Three-headed Demon Electric Lion has long surpassed E-level, reaching the D-level, a good deal for this rookie, Qian Qi.