Who was the 'angel' responsible for teaching mankind how to make weapons and fall into the sin of vanity?

No angel in the Bible assumes this role.

Azazel

"1 Enoch portrays Azazel as responsible for teaching humans to make weapons and cosmetics, for which he was cast out of heaven. 1 Enoch 2:8 reads:

And Azazel taught men to make swords and knives and shields and breastplates; and made known to them the metals [of the earth] and the art of working them; and bracelets and ornaments; and the use of antimony and the beautifying of the eyelids; and all kinds of costly stones and all colouring tinctures. And there arose much godlessness, and they committed fornication, and they were led astray and became corrupt in all their ways.
The corruption brought on by Azazel and the Grigori degrades the human race, and the four archangels (Michael, Gabriel, Raphael, and Uriel) “saw much blood being shed upon the earth and all lawlessness being wrought upon the earth […] The souls of men [made] their suit, saying, "Bring our cause before the Most High; […] Thou seest what Azazel hath done, who hath taught all unrighteousness on earth and revealed the eternal secrets which were in heaven, which men were striving to learn." "


https://en.wikipedia.org/wiki/Azazel

1 Enoch is not in the Bible.

https://en.wikipedia.org/wiki/Book_of_Enoch

Obviously, this could be debated quite a bit, if only on the definition of what's an angel, what was an angel, what or who was a devil, etc. toughy's citation works for answering the question, as stated. Nothing was asked about a bible, but there Mr. Azazel is in the Hebrew/Old Testament and others.

True nothing was asked about the Bible, and while Azazel is mentioned in Scripture he certainly isn't as the angel who taught people how to make weapons and be vain. I just want all to know that while there may be stories to this effect, they are not Biblical stories.

Just thought you might have inadvertantly misread the question, dear star. Might I suggest you venture into the forums, where you might find a bit more room, and willing participation, for bible discussion?

Thank you for your suggestion.