The cautionary tale behind this Rune is well known among wizards across the Multiverse.
The perimeter of the Growing Desert still increases by miniscule amounts every year. The spawner at the center of it creates a grain of sand every few minutes.
Buried deep beneath the sand mountain at the center of the desert is the village once called Forest's Edge, whose resident wizard was skilled enough to create the sand spawner, but not skilled enough to destroy it.
An expression beginning with this rune creates a spawner described by the next 2 arguments: (1) an expression describing a thing to spawn and (2) a length of time in ms. If a 2nd argument is not given, a 1000 ms default will be used.
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