Forging a Legend

Forging a Legend is a side quest in Fallout 76.

Quick walkthrough

 * Listen to the holotape Order of Mysteries - the Blade of Bastet.
 * Use Cryptos to access the entry "Novice | Historic Swords".
 * Use the fabricator to obtain a swing analyzer.
 * Obtain Grant's saber from The Whitespring Resort in the presidential cottage and Museum.
 * Use any workbench to add the swing analyzer to the saber.
 * Kill six different creatures with the modded saber.

Detailed walkthrough
Note: Not all creatures are counted towards the goal. The following lists contain the animals, creatures and robots known to count and not count towards this objective, however both are incomplete at this time.
 * Listen to the holotape "Order of Mysteries - the Blade of Bastet."
 * Log in to Cryptos to access the entry "Novice | Historic Swords" under "Database Queries."
 * Use the fabricator to obtain the swing analyzer by accessing the entry "Novice | Swing Analyzer."
 * Go to The Whitespring Resort's Presidential Cottage and Museum, to get the staff access card on the second floor in a bathroom next to the skeleton.
 * Use the Presidential Cottage & Museum terminal on the first floor, and access the entry "Display Case Access" within "STAFF ACCESS" to open the display case.
 * Get Grant's saber from the display case.
 * Use any weapons workbench to mod the saber with the swing analyzer.
 * Kill six different creatures with the modded saber. Types of creatures include: Rodent, bug, canine