Neoplasia Reactor

The Neoplasia Reactor is a late-game power generator that produces energy while slowly accumulating a hazardous fluid called Neoplasm. It functions as a high-output reactor that, once fed its required inputs and generating power, begins to fill an internal Neoplasm meter; if that meter reaches capacity the reactor catastrophically detonates, dealing heavy area damage and spawning Neoplasm puddles that can poison nearby structures. The block cannot be overdriven, and like Thorium Reactors and Impact Reactors it has the additional gameplay effect of attracting Eclipses. If the reactor explodes from Neoplasm buildup the player unlocks the Steam achievement "Contamination".

Operation and failure behavior are deterministic: when the Neoplasm meter fills, the explosion deals 2000 area damage in a radius of 9 tiles, and Neoplasm puddles are created out to a radius of 7 tiles from the blast center. Because the explosion spawns hazardous puddles, placement and disposal of Neoplasm are critical to safe operation.

Practical usage and handling notes:

• Neoplasm cannot be processed by Slag Incinerators. The safest disposal method is to move produced Neoplasm away from base structures and dump it onto slag tiles or into empty-space puddles. Transport lines using Reinforced Bridge Ducts (or other suitably spaced Duct structures) allow puddles to form in safe remote locations.
• If remote dumping into space is impossible, ensure any dumped puddles are far from water-holding blocks; Neoplasm puddles will damage blocks that hold water and can spread through fluid lines if not properly isolated.
• Spacing Ducts with two- or three-tile gaps and carrying Water through them helps prevent puddles from moving back up a fluid line, limiting spread toward critical infrastructure.
• Ducts do not have an item capacity and thus will not become directly infected by Neoplasm puddles as storage units might; however, connected blocks and fluids can still be affected by nearby puddles.
• The heat output of the Neoplasia Reactor can be routed to a Flux Reactor to increase total power generation. One source records an additional 5760 power contribution from this heat; another source reports the reactor’s heat contributes 6360 power to a Flux Reactor, noted as 40% of that reactor’s maximum output. Both values are reported in community documentation; builders should verify which figure applies in their game version.
• The Neoplasia Reactor’s build costs were adjusted after introduction: Phase fabric cost was reduced (from 300 to 150) and Tungsten cost was lowered (from 1000 to 750), and build time was decreased in later builds (for example from ~52.16s to ~42.66s in the referenced changes).

Because of the explosion radius and puddle spawning, the Neoplasia Reactor is best used in isolated power islands or with dedicated remote fluid routing and dumping systems. Plan for containment, remote disposal, and fail-safe routing of Neoplasm and heat to avoid catastrophic damage to the main base.