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E-118 Tau is an E-100 Series robot.
History

Tau was the nineteenth E-Series robot created by Dr. Eggman. At some point E-102 Gamma tracked it to a mountainous region of the Dragon Kingdom, destroyed it, and freed its Mobini. (ASUB)
Background Information
- Tau was never formally introduced in the Pre-Super Genesis Wave Timeline, but its fate in that universe was revealed in the (now defunct) Sonic Universe blogs.
- The general design of Tau is modeled after the traditional depiction of a flying saucer.
- Its destruction by lightning is reminiscent of the Doomsday Pod's defeat in the SatAM episode "Cry of the Wolf" and its comic adaption in issue #113.