Arcway

The Arcway is one of the max-level dungeons introduced with World of Warcraft: Legion located within Suramar City. The Arcway stretches beneath the city proper, but then continue through the entire zone of Suramar. Adventurers attempt to make their way through this winding network in an effort to gain entry to Nighthold. The entrance can be found in the Sanctum Depths of the Sanctum of Order.

An uninstanced section containing The Fel Breach can be found in Felsoul Hold, where the Legion's activities are damaging the nearby Suramar City beyond just scorching the edge. For some reason, the instanced version of Felsoul Hold is turned 180 degrees.

Originally released with Legion as a Mythic-only dungeon, with Patch 7.2 the dungeon was also made available in Heroic mode.

Background
To become a captain of the Moon Guard during the time of the Kaldorei Empire, aspirant Guards were required by their ancient laws to undergo a traditional rite: patrolling the Arcway for three weeks without rest, the vast labyrinth putting their skills as a Guard to the test. Only a captain could receive the power of their order.

The tunnels are considered defunct. They were abandoned when a disaster disrupted the mana collectors operating there and the tunnels became unstable. The Nightflow Conduit is located here, which is the main leyline conduit for Suramar City; it pulls ten times the amount of energy than the maximum available for Shal'Aran.

Adventure Guide
''As vast as the city of Suramar is, the vast network of tunnels beneath the city spans an even greater reach. Nightborne society has grown to depend on the power of the Nightwell, and the Arcway delivers that lifeblood throughout the city. This labyrinthine complex was built thousands of years ago, running beneath the foundations of the city's largest buildings, and most modern citizens live their lives entirely unaware of what may lurk in the shadows beneath their feet....''

Achievements

 * Mythic: The Arcway
 * Mythic: The Arcway Guild Run
 * Arcanic Cling
 * Clean House
 * No Time to Waste