...
Arthur and Leonard managed to force Dion to fall on the ground but the expression on their faces was pretty serious. They already threw quite a few of their strongest skills but they were barely able to lower its Health Bar.
They indeed dealt a strong blow but it seemed to be just a drop of water in the pond compared to the totally healthy HP bar of the giant.
They couldn't throw those kinds of attacks continuously. First, they had cooldowns. Second, they would surely exhaust themselves mentally before they could even drain its HP down to zero.
Physical exhaustion was not a problem since they practically have inexhaustible stamina within the game. But their mental strength still had a limit and it would continue to drain if they didn't manage their skills right. And a slip in concentration was going to be fatal in this kind of battle.