Before you can command your entity to use skills (gem cmd use <skill>), you will need to have control over your entity. This spell will establish a link between you and your entity, allowing you to command it. Without this bond your entity will be very weak and vulnerable. This spell uses 1 rift spark. Extra sparks (max 10) can be used to reduce the spell cost and increase the duration, e.g. cast establish entity control at 3