The Robotics Workshop section of the Super Destroyer houses the automated weapon systems of the Helldivers fleet: automated sentries, mortar batteries, guard dogs, and arc-discharge technology. Among its advanced upgrades, Circuit Expansion stands out as a unique force-multiplier for energy-based squad builds.
What Does Circuit Expansion Actually Do?
The in-game tooltip states: “Lightning arcs fired from weapons and turrets jump to one additional enemy.” While this sounds simple, in practical combat on Helldive difficulty, adding an extra chain bounce fundamentally changes horde-clearing math.
Affected Weapons & Stratagems:
- ARC-3 Arc Thrower (Support Weapon): Base lightning bolt chains to 3 targets. With Circuit Expansion, it chains to 4 targets simultaneously, delivering armor-ignoring electrical discharge through medium Automaton squads and Terminid Warrior swarms.
- A/ARC-3 Tesla Tower (Defensive Stratagem): Every discharge from the tower zaps an additional adjacent enemy. In tight canyon chokepoints on Eradication or Defense missions, a single Tesla Tower supported by Circuit Expansion can solo entire bug breaches.
- ARC-12 Blitzer (Primary Shotgun from Cutting Edge Warbond): Each blast arcs between more enemies, increasing total damage output per pump.
Synergies with Other Robotics Workshop Modules
To maximize the survivability and lethality of automated sentries, combine Circuit Expansion with adjacent robotics upgrades:
| Module Name | Tier | Mechanical Benefit |
|---|---|---|
| Targeting Software Upgrade | Tier 1 | Sentries deploy with zero activation delay upon Hellpod impact. |
| Shock Absorption | Tier 3 | +50% ammo for Sentry turrets (Autocannon & Gatling sentries last significantly longer). |
| Circuit Expansion | Tier 4 | +1 Lightning chain link to all arc weaponry and Tesla towers. |
Friendly Fire Warning & Positioning Protocol
Lightning arcs do not distinguish between Terminid chitin and Helldiver democracy. When Circuit Expansion is active, the extra bounce has a high propensity to jump toward squadmates if they stand within a 45-degree cone behind the primary target. Always position yourself laterally to your team when unleashing continuous Arc Thrower fire!
