Types/UnitSpawnDefinition

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The prototype docs have moved to a new website with an improved format. This documentation page can now be found here: https://lua-api.factorio.com/latest/types/UnitSpawnDefinition.html

This wiki page is no longer updated and will be removed at some point in the future, so please update your browser bookmarks or other links that sent you here. If you'd like to contribute to the new docs, you can leave your feedback on the forums.


The definition of a spawnable unit for a Prototype/EnemySpawner. It can be specified as a table with named or numbered keys, but not a mix of both.

Mandatory properties

unit or 1

Type: Types/string

The name of a Prototype/Entity.

spawn_points or 2

Type: Types/table of Types/SpawnPoint

Array of evolution and probability info.

  • The evolution_factor must be ascending from entry to entry.
  • The last entry's weight will be used when the evolution_factor is larger than the last entry.
  • Weights are linearly interpolated between entries.
  • Individual weights are scaled linearly so that the cumulative weight is 1.