The Charge Gauge is a new mechanic in Chaos Rings II that occurs during battle. It has a total of three charge bars, each filling up slowly through attacks from either side. The Charge Gauge allows characters to perform unique Awakening commands with a simple number of charges - for example Darwin with two charge bars can perform the Collbrande attack, which strikes a single target up to 5 times, with each hit increasing in damage value. The Charge Gauge also opens up for the Advent command, which can only be used when under the Pair status. Advent are the summonings of the game - they require both characters to deal either incredible damage or effects.
The strength of an Awakening or Advent depends on how many charges it costs. Stronger skills usually require more, although some will only require the exact amount.