We present Kora, a fire system for visual effects production. It consists of (i) a weakly compressible, sparse, spatially adaptive, MPI-distributed physics-based combustion solver, featuring a novel energy cascade turbulence model and support for adiabatic cooling; (ii) a Houdini‑centric abstraction layer that exposes the advanced combustion routines through intuitive, artist‑friendly interfaces. Key components include customizable premixed fuel sourcing, liquid-gas coupling and vaporization, control and art‑direction utilities, as well as physics‑based shading and render‑graph integration. We describe the architecture of Kora, its solver foundations, and how we put it into practice in Avatar: Fire and Ash.