The combo gauge offers several benefits for players, giving you the choice to activate it or not. When the combo gauge reaches 50% to 100%, your character will move and shoot faster, and you'll observe an aura forming around them. At 100%, a red light will flash from the character, signaling the option to activate the combo. Doing so grants a powerful melee weapon for a brief period. It also depletes the combo gauge to 0 and resets your kill combo.