You each step through the portal, and as you do, you seem to be spun in a circle, as if you were caught in a whirlpool. You spin, and as you spin, it is as if the surroundings stretch below you, until you don't see the cavern anymore. After about 20 seconds of this disorienting spinning, the spinning begins to coalesce, as you feel your weight shift from a weightlessness back to standing on solid ground. As the weight shifts, you each take one knee, and a loud sound emanates from your space, like that of a sonic boom.
You find yourselves in a somewhat ethereal place, and you all look at each other and see yourselves as translucent vestiges of yourselves. Your surroundings seem to be in the dim light of darkvision (grayscale colors), but you can see the distances as if it were day.
You are standing in a teleportation circle on the floor, which is located at the bottom of a 6-foot trench.
You peak out of the trench, and you see a network of trenches like this one, but whereas yours seems abandoned, those trenches hold angels, spectral conscripts, and sword wraiths, looking ahead at other trenches that house various demons, devils, other conscripts, and other sword wraiths. There are massive banners of either side and you see and hear enemy arrows, magic missiles, and other energy blasts zooming out around in your direction before you duck back down.
The trench leads in one direction (you're not sure which way is north yet), and then sort of veers, but in the distance you see a huge city, rivaling the size of Sharn, in that direction. Unlike Sharn, this city has been weathered and impacted by the war that rages outside of it.
After taking in all of this sensory information, you all notice Battlecat sniffing and paying attention to a strange coin on the ground (it is the size of a US quarter).

[ +- ] Ref: Size of coin in the palm of a hand
[ +- ] Alin's and Kevin's Knowledge of the Region
In your various studies and research on the planes, you have heard tales of the City of Knives, a city in Shavarath that lies between the Legions of Justice and Tyranny, representing the impact of brutal war on a glorious city.