Hi, my name is Luiz and is my first character here in D&D Beyond and I would like to know if there is any way to make an old UA available in the char creation.

My intention is to create a Warlock with The Raven Queen as my Patron, but in char creation, I couldn't find her.

Here is the  2017 UA that I'm talking about.

Is it possible to create a Patron as Homebrew, so I can replicate The Raven Queen, and use it in char creation?

Look in XGtE, find The Hexblade, direct mention of the Raven Queen and the UA mentioned...

You can just buy The Hexblade portion of XGtE if that is all you want out of it.

Hi Pedroig, unfortunately buying Hexblade doesn't appear the Reven Queen, only the Hexblade Patron.

I'm trying to find another piece of a book that can enable her.

Thank you very much.

 Umm, I'm confused, this is in the Warlock/Hexbalde rules/info:

Because the Raven Queen is known to have forged the first of these weapons, many sages speculate that she and the force are one and that the weapons, along with hexblade warlocks, are tools she uses to manipulate events on the Material Plane to her inscrutable ends.

Hexblade/Raven Queen can be considered the same.  If you want it more specifically you will have to homebrew it, which seems like a lot of work to simply rename something.

Raven queen is old UA, meaning they won't put it up, just in case things are wrong. The best way to build. A raven queen warlock is to go hexblade, pact of the chain, with raven as familiar. Hope this helped👍

Well, thank you very much for your answer.