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Penumbra is the speculative fiction e-mag published monthly by Musa Publishing. At Penumbra, the Muses are clustered in the part of the psyche caught between the darkness and the light. Whether that results in hardcore science fiction or fantasy humour, psychological horror or a Steampunk poem with a twist is out of the Muses' control. That control is in the hands of the author.
- June 15, 2014 Initial release
- August 31, 2014 New version 3.1.4
- June 23, 2015 New version 4.3
- July 09, 2016 New version 6.0
- June 15, 2019 New version 6.16