Ehm Father Bronze
I think I can clearefy why you might know about Bladesingers
I was looking at what classes excist in AD&D (to bad these we only half descibtions) and i found the Bladesinger
They also showed what book the class was in
And the Bladesinger class can be found the the Book of Elves
Not in het general player book
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The Githyanki Necromancer/Assassin - New and Improved