The Soul Satchel is the window players will use to purify Chaos Souls .This can be accessed either through the Soul icon at the bottom of the screen or by pressing (V) on the keyboard. If players are near a Soul Sanctum players will have the option to do a normal purify but the cost will be twice that of a co-op purification. A Co-op purification can be done anywhere in game as long as there is someone nearby willing to help. This does not require that both players be in a party. They only need to accept an invitation.