Dea's Fission

The reactor comes in two sizes and is assembled as a multiblock using the GregTech multiblock system and its hatches. Installed fuel pellets produce heat, and more pellets produce more heat. Higher heat causes more violent reactions and faster fuel use. A custom renderer shows the current heat level, and the reactor's heat-battery slowly cools down on its own.

The reactor takes a set amount of input fluid as coolant, heats it, and outputs another fluid, with per-tick operation and fractional amounts. Recipes can gate on heat, and fuel damage scales with the current heat. Different fuels generate heat and leave depleted outputs. The reactor insides can be customized through a component system that changes stats such as maximum heat capacity. The mod is built for modpacks, with KubeJS support and custom fuels for pack developers. Dea's Fission requires GregTech CEu Modern, and it is published for Forge only, in 1.20.1 builds.