Miasthenia was founded in the beginning of 1994, idealized by Hécate(vocal/guitar), Vlad ( bass/vocal) and Mictlantecutli (drums).
In 1995 they recorded the rehearsal-demo “encanto do sabbat”which the lyrics were sung in Portuguese. This work had the support of sound riot productions on the distribution. In 1996 they recorded the demo "Faun - Trágica Música Noturna" in which they included the keyboards to their compositions.

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