Sandustry Lava
Quick Answer
Lava comes from Lava Caves or from igniting Cinder held in a Filter. When Water touches Lava, the interaction produces Steam.
Use confirmed Lava sources
The official Lava reference identifies Lava Caves and Cinder as sources. A Filter can hold Cinder in place so it can be ignited and converted into Lava.
Plan for the Water reaction
Water touching Lava produces Steam. Keep a controlled reaction area and leave a clear route above it, because Steam rises and can condense back into Water under the conditions described by the official Water and Steam references.
Avoid unsupported performance claims
The verified source material does not establish a universal temperature, throughput, or best Lava layout. Treat those values as version-sensitive and confirm them in the current build before publishing or scaling a design.