Which is absolutely ridiculous. Spell points have been an official rules variant for 20 years. The 5e DMG came out in 2014. I have a hard time believing it would take more than a day to implement. All you'd need is a slider in the class description page, then when you cast a spell, you hit "cast" just like usual, and it subtracts the appropriate amount of SP from your pool, which is clearly laid out and needs no calculations.
I'm trying to use the variant rules for spell slots but I can't find where to use it for my characters
That optional rule has not been implemented yet.
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Which is absolutely ridiculous. Spell points have been an official rules variant for 20 years. The 5e DMG came out in 2014. I have a hard time believing it would take more than a day to implement. All you'd need is a slider in the class description page, then when you cast a spell, you hit "cast" just like usual, and it subtracts the appropriate amount of SP from your pool, which is clearly laid out and needs no calculations.
Is there any information about whether this variant rule will be implemented any time soon?
No.
Creating Epic Boons on DDB
DDB Buyers' Guide
Hardcovers, DDB & You
Content Troubleshooting