I've been trying to create a feature similar in nature to Drow Magic, but I haven't been able to get it to work. I've put it as one use, reset on long rest, no using spell slot, and yet it pretty much ignored all of it. And I don't have the SCAG so I can't just see how Drow Magic is made and use that. Any help would be appreciated, as long as it's not something along the lines of "bro just buy the book."

Quote from Kage133 >>

I've been trying to create a feature similar in nature to Drow Magic, but I haven't been able to get it to work. I've put it as one use, reset on long rest, no using spell slot, and yet it pretty much ignored all of it. And I don't have the SCAG so I can't just see how Drow Magic is made and use that. Any help would be appreciated, as long as it's not something along the lines of "bro just buy the book."

 
Drow Magic is a feature of the Dark Elf (Drow) subrace from the Player's Handbook, not SCAG.

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Add spell

Spell: Choose the spell you want to add

Ability Score: Choose the spellcasting ability score to use for this spell

Number of uses: 1

Reset type: Long Rest

Consumes Spell Slot: No

Available at Character Level: the character level you want them to gain this spell.

Save (spell page, blue button)

Save (main page, orange button)

Done.

Ah, right, I was thinking of Half Dark Elf. Though in any case, this is exactly what I did and it still won't work.

Quote from Kage133 >>

Ah, right, I was thinking of Half Dark Elf. Though in any case, this is exactly what I did and it still won't work.

 
Then you did something wrong or missed something and not realised it.

I can say with perfect confidence that I didn't, so I'm going to give the benefit of the doubt and assume that DNDBeyond is just messed up.

Quote from Kage133 >>

I can say with perfect confidence that I didn't, so I'm going to give the benefit of the doubt and assume that DNDBeyond is just messed up.

 
Given that it is the same system for everyone, including actual official stuff, if it didn't work then it would cause problems for every user on the site.

It's just you being affected.

So it was you.

Take screen shot showing the whole thing. 

Quote from Kage133 >>

I've been trying to create a feature similar in nature to Drow Magic, but I haven't been able to get it to work. I've put it as one use, reset on long rest, no using spell slot, and yet it pretty much ignored all of it. And I don't have the SCAG so I can't just see how Drow Magic is made and use that. Any help would be appreciated, as long as it's not something along the lines of "bro just buy the book."

 
Check the Tiefling’s Infernal Legacy trait, it works the same more or less. You can also find a walkthrough on how to set it up in the Homebrew Subclasses & Species FAQ, question #14: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq#HomebrewSubclasses&SpeciesFAQ), and if it still isn’t working please see the General Homebrew FAQ, question #6: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq#GeneralHomebrewFAQ&BasicTroubleshooting).

Thank you both for taking time to reply to this topic. After extensively editing and testing my Homebrew I finally figured out the issue: Avrae. Everything functions perfectly in DNDBeyond, but it doesn't work in Avrae for whatever reason (the counters even show but don't get used!)

The conclusion: Use Dicecloud when doing something like this for discord.

It would have been helpful if you mentioned this wasn't about D&D Beyond and was an external thing. 

I could have then told you that Avrae is buggy with homebrew stuff and is primarily for official things.