Professor Huyang's technical manual

Professor Huyang's technical manual was a manual written by Professor Huyang, an architect droid who served the Jedi Order, that contained at least five volumes. A note to check the fifth volume in the event of needing more specific instructions when constructing a lightsaber was included in an Jedi text owned by the Jedi-in-training Luke Skywalker, who sought to acquire a new kyber crystal after his current crystal was cracked when his lightsaber was crushed by a Killdroid. The fifth volume also contained schematics of battle sabers.

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