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From Warhammer 40k - Lexicanum
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The '''{{PAGENAME}}''' is an experimental [[Tau]] device to allow for [[FTL|faster-than-light]] travel.
The device was developed by [[Earth Caste]] scientist [[Ka'buto]] through years of studying [[Imperial]] FTL technology and old wreckages of [[Kroot]] [[Warsphere]]s. Once fitted to a space vessel, the module creates a bubble of [[Wikipedia: Anti-Matter|anti-matter]] around the ship and propels it at such a speed that it can pierce the fabric of reality itself. Initial test flights were incredibly successful and allowed any vessel equipped with one to traverse the entire span of the empire within a few days, a journey that previously required many months.{{Fn|1a}}
However despite Ka'buto's warnings, the [[Ethereal Council]] activated hundreds if not thousands of of AL-38 modules simultaneously at [[Numenar Point]] to begin the [[Fourth Sphere of Expansion]]. The resulting mass use of anti-matter created a tear of reality that swept the Tau fleet away. In the aftermath of the Numenar Point disaster the Ethereals scrapped the entire AL-38 program.{{Fn|1a}}