Flux Reactor

The Flux Reactor is a late-game power generator that converts accumulated heat into extremely high power output. It requires heat input from external heaters or other reactors rather than producing its own fuel-driven heat; without adequate cyanogen supply the reactor builds instability which will eventually trigger an explosion, functioning similarly to the Thorium Reactor's heat mechanic. The Flux Reactor has the highest base power generation among all blocks on both planets and scales with speed boosts from items like the Navanax.

Flux Reactors accept heat inputs and convert each unit of heat into large amounts of power. Across builds, the reactor's base generation and heat requirements changed: originally added in build 137, its heat input and base power were increased in later builds (notably build 147 raised base generation and heat input, and build 149 further increased base power and adjusted build cost and time). Current play usage treats the reactor as a sink for concentrated heat rather than a self-contained fuel consumer.

Practical setup and usage notes:

• The reactor must be supplied with cyanogen to prevent instability buildup; absence of cyanogen increases an instability stat that leads to an explosion when full. Keep the Cyanogen Synthesizer supplied or the reactor will become hazardous.
• Heat sources that pair well with Flux Reactors are Phase Heaters and Neoplasia Reactors because they provide very efficient heat per running cost. Electric Heaters can be used but are less efficient relative to Phase/Neoplasia options.
• Typical ratios (build-specific): the reactor converts roughly 50–106 power per unit of heat depending on build/version and how heat is measured; in some ratio guides a Flux Reactor produced about 51.43 power per heat unit, while other figures report 106 power per heat unit in certain contexts. Phase Heaters and Neoplasia Reactors remain the recommended sources for reaching the reactor’s maximum heat input.
• Example configurations:
  • Neoplasia Reactor support: a single Neoplasia Reactor contributes a significant fraction of the Flux Reactor’s heat maximum (commonly cited as around 40% or 3/7ths), two will cover most needs but are expensive; using Neoplasia Reactors is powerful but costly and can outmatch the Flux Reactor’s output, introducing additional failure points.
  • Phase Heater support: multiple Phase Heaters (commonly nine in guides) can bring the Flux Reactor close to maximum output; ten Phase Heaters can reach the heat maximum and an extra heater provides the additional heat needed to run a Cyanogen Synthesizer at 9/sec.
  • Electric Heaters: they generate net power but far less efficiently than Phase or Neoplasia setups. Electric Heaters can be used for jump-starting Phase Synthesizers or finely tuning heat distribution with Heat Routers.
• Heat routing and divisibility: the reactor’s ideal total heat requirement often does not divide evenly by common heater outputs, so adding a Phase Synthesizer or arranging Heat Routers helps make totals divisible by 3 and easier to balance across multiple devices.
• Efficiency and limits: Flux Reactors cannot exceed 100% efficiency; reaching near-full output requires careful planning of heater counts and cyanogen supply. Using Neoplasia Reactors to drive the Flux Reactor is powerful but usually overkill and can be inefficient from a resource-cost perspective.

Other facts:

• A powered Flux Reactor does not attract Eclipses despite its name.
• Flux Reactors, like Thorium Reactors, do not leave behind ghost blocks for safe rebuilding after an explosion.
• Speed boosts multiply the reactor’s already-high base output; for example, a 300% boost raises base output significantly (sources cite increases up to a large multiple such as 47700 power units/second under specific boosts).

When building Flux Reactor arrays, prioritize stable cyanogen flow and choose heat producers that balance resource cost against required heat. Plan heat routing and redundancy to avoid instability explosions and to get consistent, very high power output.