The Shooting Range and the Deep Shadow Realm

At the shooting range onboard the train, you can undertake special challenges at the simulated Shadow Realm Edge of Survival. This is where you can truly push the envelope and test the limits of your firearms skills and techniques!
You can quickly access the shooting range for the challenge from your Snezhnaya Adventure Journal.

Unlock Edge of Survival challenge stages by first completing the corresponding Shadow Realm challenges in Snezhnaya.

Before the challenge starts, you may select Difficulty Clauses of various types that have effects such as enhancing the opponent's HP, ATK, and combat skills. Doing so will raise the overall difficulty of the challenge.
The more Difficulty Clauses you select, the higher the overall challenge difficulty will be, and the more points you earn from defeating an opponent.

Once the challenge begins, you have to defeat as many opponents as possible within the time limit.
Every opponent you defeat earns you the corresponding points as well as extends the challenge duration.
Earn additional points when you establish and maintain a defeat streak.

If you manage to defeat every opponent in the time given, you will also earn bonus points based on time remaining at the time of your last kill. The more time you had remaining, the more points you get.

Each challenge stage has its own Frontrunners' Edge section where you can see how your friends and other Travelers are doing.