Spend a few nights tweaking an Endfield endgame factory and you start to feel it in your bones: Carbon is the choke point, and Xiranite lines are where good layouts go to die. I kept thinking my Forge of the Sky setup was "fine," then wondered why it still crawled. If you're in that same loop, the chatter around Arknights endfield boosting makes a bit more sense, because what actually fixes the problem isn't another fancy blueprint, it's a boring input material most of us ignored.

Why the old Buckflower habit hurts

For ages, the community default was simple: farm Buckflower in Valley IV, shove it into a Refining Unit, and accept the output. One plant becomes one Carbon. Clean, predictable, and it "felt" intended, so nobody questioned it. The issue is that one-to-one ratio quietly forces you to scale sideways. More gathering routes, more storage buffers, more Refining Units, more power, more conveyor clutter. Then you hit the real wall: Forge of the Sky caps. You can't just keep slapping down extra forges when the game tells you no. So you end up with a layout that's huge, fussy, and still starving the forge line.

The Jincao twist nobody read properly

After 1.1, people started testing plants the way you test weapon breakpoints: run it, count it, repeat. That's when the "healing plant" got a second job. Jincao, and a few other Wuling natives like Yazhen, refine into two Carbon per plant. Not a bonus sometimes. Not a crit. Just flat double. It's the kind of thing you'd expect a tooltip to scream about, but Endfield loves hiding the good stuff in plain sight. If you've been turning Jincao into drinks by habit, you may have been sipping away the most efficient Carbon source you own.

What it changes for Stabilized Carbon and Xiranite

Once you switch to Jincao-based Carbon, the whole chain relaxes. Your Refining Units don't have to be a whole district. Stabilized Carbon stops arriving in little drips and starts coming in steady pulses, which is exactly what the Forge of the Sky wants. You'll notice it fast: fewer pauses, fewer "waiting for materials" icons, less micromanaging buffers. And because your Carbon footprint shrinks, you can spend that space on the parts that actually scale your output—better routing, smarter storage placement, and a forge line that stays fed even when you're off doing combat or exploration.

Rebuilding without wasting a weekend

If you're planning a rebuild, don't tear everything down at once. Swap the feedstock first, watch the Carbon graph, then trim the extra machines you no longer need. Keep a small side batch of Jincao Drinks if you rely on them, but stop treating consumables as the "main" purpose of the plant. And if you're trying to catch up after a rough patch—missed farming days, bad routing, or just an underbuilt economy—some players also top up supplies through marketplaces like U4GM while they redesign, so the factory doesn't stall mid-upgrade.