Hi there, I found this on Paradox forum :

Miracles
Beatific is now a tiered trait, opening up various Miracles
Gain trait XP through:
- Lay on Hands (up to 25 XP)
- Converting a character to your faith (up to 25 XP)
- Converting a county to your faith with your Court Chaplain (up to 50 XP)
- Banishing Demons via interaction, or hunting them via Journey
- Finishing Inquisition Objectives
- Gaining the final perks of Holy Arts
- Gaining Theurgy perks
- Through a rare Umbra Expedition in the Astral Reaches
Lose trait XP by committing theft (**10 XP) or torture (**100 XP)
Artifacts that once gave Beatific now give a specific Miracle instead.

https://forum.paradoxplaza.com/forum/threads/mod-princes-of-darkness.1414717/page-84#post-29436794

As a vampire (Menele), I get TF really late, so converting county isn't an option as almost all of my neighboors are the same faith as me (Camarilla) and I don't really go crusade frenzy !
Lay on Hands gave me the XP, and Theurgy perks too. I don't really understand how converting character works, as it didn't seem to gave me XP when I use it on innocents or vampires, maybe a bug, or maybe it's only working on specific types of characters.
My game wasn't a demon start so that's not an option neither.
Right now, I'm roaming the Astral Reaches, but I don't really know where to search.
So yeah, right now I'm capped at 30 XP too.

thanks a ton zet, own you big time, but the funny thing is i actually did many hunts on demons and didn't gain any beatific exp (i used the find lair decision and only gained true faith and and renown points

You're welcome budy.
It seems to be a recent feature (the patchnotes are from march), so maybe it needed some more works to work perfectly, I think it only really work if you do some very specific actions, maybe the hunting thing isn't the only condition to trigger the XP gain. I don't have the courage to explore the mod files, but it's relatively easy to read if you want to give it a try.

I also just understand something, the XP cap is global, so if you already hit 25XP, you won't gain nothing from Lay on Hands or converting characters even if you never did it.

Try first to convert county with your chaplain until you hit the 50XP cap, then try to banish demons via interraction as the patchnotes said.
I'll continue to explore the Astral Reaches from now on. I'll tell you if I find the event, but I'm more or less a true immortal god in my party, and I don't really have to do anything else anymore, so maybe it won't really help you much if you are a hunter.

Good luck on your way to become a saint !

So... I roam the Astral Reaches for almost 200 years, explore every location until I reach the "known" limit for each of them, get to alot of adventures there, and never get XP for beatific trait. It seems easier to reach Golconda (I got it and lost it twice already) !
If a anyone of the team could point me out where do I have to look for that would be very kind of you. I realy want to try to become mortal before ending this run, as I haven't anything to do appart from searching the Dream and the Deep Umbra (I'm in 1970+, and already did all the major objectives, even becoming a third and rallying all clans to Camarilla).

I am probably reading into this wrong, but does that mean I have to banish demons the rest of the way from 50xp? I can't seem to identify what "Theurgy perks" are. Additionally, for some reason when I complete inquisition objectives I don't get any beatific points.

I wouldn't say I am capped at 50, I technically have 52 now. But that took decades to earn those 2 form banishing demons. There has to be a more efficient means to level this skill. Without some form of immortality, I don't know how one would ever achieve 100 in their lifespan. But again I am probably reading into this wrong.

Update: just found Theurgy, its like Demonology and can be learned. More to follow

what's also funny is that you can become an mage, adquire the perk that allows you to become immortal by adquiring certain events (getting some vampires or mummies) and then your character will not die, if you choose the mummie routh you literally just become immortal and your character that will have massive stat boosts due to the buildings that give lifestyle xp like it's candy and now you have a character that can beat the ♥♥♥♥ out of god with a sneeze, and the malus for it it's just -20 but with so many buildings that give you massive amounts of opinion to other vassals and same faith groups, it will not be a problem at all

I do agree with zetmerguez. The order in which you use these sources is very important.
The first 25 xp are very easy. Just ask every mortal courtier to convert. You can also give Baronies /minor settlements to people who do not share your faith. Just pick people who like you and who are not zealous. Then ask them to convert. Fire. Repeat.
Or just try to convert Barons of Provinces that you gained through regular concquest ant not through holy wars. Don´t fill Barony positions with autogen characters or with people who already share your views.
These conversions only seem to count when they are more or less voluntary. Bullying my prisoners did not seem to work "Say that you agree with me or rot here for all eternity". When people ask for compensation that is also problematic. "Sure I believe in Jesus. Just give me the money first."