Soul Hackers 2

Commander Skills are special skills used by pressing the approriate button when in battle (on a PC, this is the X key). You unlock them after clearing Arrow's Soul Matrix 1F as part of the main story. Next time you go to COMP Smith in Mansei Realm, Tara will tell you about them and they will be available to purchase as upgrades to Ringo's COMP, Antikythera. The cheapest and simplest skill to use is Conversion, which allows you to swap any 1 party members demon in battle. Note, Ringo must be both alive and not Sealed to use Commander Skills. There is also an achievement for using all of them.