In the 26th Aethyr, DES, you will confront the limitations of the human mind. The human mind is a manifestation of your spiritual mind in time, space, and form. The misconception of course is that the human mind is in control. You see! In physical reality the spiritual mind takes a seemingly back seat to the ego, because it recognizes the fact that without the ego to protect you from harm, there would be no existence in the physical plane. However beyond the scope of coping with the moment, the ego is very ill-equipped to handle your destiny or your long term goals. It is here in DES that this lesson is presented to you.
The being confronted in DES will be your own ego. If you see an Angel or other being in DES, know it to be an aspect of your own human mind come to present you with the cold truth about who's really in control. Below DES the ego appears to have a supreme control over things, even while you are engaged in various adventures. In DES you find out that without your divine mind, there would be no human mind or self for that matter. Here, the ego is not supreme, nor is it independent. Although worshiped by many, the ego is a creator of circumstantial events rather than a creator of events. Children come into the world without a sense of ego. This very fact gives children their innocence and purity. The sense of ego must be acquired and developed in them as they grow in order to function properly in society.
In DES you learn to strip away much of that ego (the excess) so that more of the divine mind can come through. The divine mind then begins to retake the helm of your life, while your ego looks after your immediate physical safety, as it was meant to be all along. Without your ego properly put in its place, you will not be able to get the benefit of the lessons contained in the Aethyrs above DES, for this reason this Aethyr is an important one. And for this reason proper completion of this Aethyr gives you the magical rank of Practicus.
* additional source material: "Enochian Magick" by Gerald J. Schueler, "The Golden Dawn" by Israel Regardie