Triple click the green flag so audio works. Press space to play the animation, (You can change the button) How It works: Once thrown, the cube will pulse for 5 to 10 seconds, Once it has finished pulsing, if the target is in range it will play an animation, It will also play a small cutscene. The Prison Realm will be the ability that replaces Kenjaku's domain (since we never saw his domain). It will instantly kill any non-boss enemy. If you trap a boss within the cube, It will stay on the floor with a timer above it, While a boss is in the cube, you will be able to use other abilities, which still dmg the boss, sealing the boss also does some dmg (you choose the dmg). Once the boss is freed, it will go back to attacking you. However, if you defeat the boss while it is still inside the cube you can pick up the cube and it goes on a short cooldown. Using the cube after you have defeated a boss inside it will release the boss to fight for you, after you do this, the prison realm is able to be used to trap an opponent again (You can only trap bosses). The boss that you release will have extremely nerfed health and dmg, it will keep fighting until it is exorcised or the enemy is defeated. If you trap something and it is released, then the cube will go on a LONG cooldown (you figure that out) So for short: you can trap a dude in there to fight for you or you can seal them, basically working like infinite void but better.
Me. Thanks to Jjk for some sounds I'll make the rest later, and the sounds are a bit buggy.