If Kyran joined them, they might end up with an easy win and lose more than the chance of providing a stage for everyone there to form a synergy— he could rob them of the sense of accomplishment in winning a battle.
Considering all this, Kyran decided to simply observe from afar. Then again, he might not have the opportunity to watch the battle itself because of the plan Achim and Nahir prepared.
Part of the Armakea Border's HQ is also within the chasm walls. But there is a wide crack on the chasm leading toward Armakea, like a ravine, and is where most of the buildings, and outfields for assembly, greenery, or training are done.
The Armakea's steel wall faces south, while the gates that leads inside the country is facing north. Thus, the steel wall is called the Southern Wall, and the gates, the Northern Gates.