Small Fusion Reactor

Small Fusion Reactor produces a lot of Power by spending non-heavy fuel (such as Deuterium Rod) and coolant (such as Liquid Nitrogen).

Coolant
Coolant is needed for safety. You can run the reactor without any coolant, but it will quickly overheat and explode. This doesn't destroy the reactor itself, but the explosion can harm the nearby player or NPC, will deal minor damage to nearby blocks, and also will stop the reactor (it won't start again without the coolant).