Biome survey
Floating Machine City
| World code | U4-optional |
|---|---|
| Branch | Sky |
| Route status | Optional / secret route |
| Palette | sky-blue + rusty iron red + patinated copper green |
| Materials | metal_machinery atmosphere |
| Controller on file | Crimson Wrencher Leader, Siegegrid Array |
| File no. | WN-BIO-14 |
Field summary
Optional flying-vehicle biome; helicopter, airship, and mini-zeppelin routes through a sealed goblin sky city, with invisible raiders revealed by the Scanner.
Survey notes
A roaming zeppelin-city built by multicolored goblin tinker clans: turbine houses, zeppelin docks, suspended walkways, balloon tanks, sky-market stalls, and under-keel engine corridors hanging above open cloud. The city builds the sky pods and repair craft seen across the Up branch. It is noisy, painted, improvised, and dangerously clever — and it is stuck. The main power core has only enough energy to hold altitude, not to roam.
Two-thirds of the city is sealed. The Crimson Wrenchers, a rival red-painted goblin faction, seized the auxiliary power sources and built hacking rigs from them, turning the city's own non-sentient machines against their makers. Their most dangerous invention is stolen invisibility technology mounted on planes and mechs; the Scanner badge from Bamboo Thicket reveals their outlines, though the sharp-eyed can track exhaust flickers and prop-wash ripples without it.
This is optional side content off Cloud Terrace, and it is not an Aria Controller story. The climax is a goblin faction showdown against the Crimson Wrencher leader in a hacked mega-zeppelin mech, after the party defends the town center from invasion. Restarted auxiliary engines lift the city out of its stranded hover, and the Floating Machine City resumes roaming the world as the handmade vehicle culture behind the Up branch's long routes.
Levels on record (11)
- U4O-1 Cloudline Tow-In main
- U4O-2 Dockside Lockdown main
- U4O-3 Pod Factory Run main
- U4O-4 Turbine Block Drift main
- U4O-5 Crimson Relay Core main
- U4O-6 Under-Keel Salvage main
- U4O-7 Main Core Invasion main
- U4O-B Redline Mega-Zeppelin boss
- U4O-C Tow Craft Docking Trial trial
- U4O-D Sky Pod Sorting Trial trial
- U4O-E Turbine Airship Drift Trial trial