as much as possible avoid using the max damage and defense multiplier especially in guild boss and arena. I only use like 3x or 4x if i want to push stage or instances like dungeons.
Yeah, sometimes i accidentally use 5x in arena but as much as possible, avoid abusing it so the dev won't notice the anomaly in the game and detect it.
I see a lot of people abusing it. Imagine, VERY VERY low cp but managed to become top 1 in boss damage ranking and the heroes are very obvious because its too weak