Disclaimer, consider this pob as a rough guideline transition from after the budget pob: https://pastebin.com/3YUErV5L

https://www.youtube.com/watch?v=0SpQH-6E_kg&t=3959s
Progression from beginning maps to iridescent/screaming. Maven/uber elder is going to take expensive upgrades such as empower 4/ cluster/ skin of the lords/ few woke gems and around level 94 passive points, which can be farmed for on 2 voidstones with expedition.

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Also I wouldn't recommend league starting as BV, but rather start as poisonous concoction, farm for asenath, obliteration, and a dendrobate before consider swapping, it will make life much much better. If you can wait til you have a glorious vanity xibaquas and a ming's heart than even better. I'll be uploading map clears of t14 red maps at the various stages of budget soon.

heya, just here to share some of my pobs for league starting as poison BV ascendant, both league start and endgame variants. Reason I'm choosing ascendant over occultist is that with the changes to occultist, the gap between scion and occultist is much closer. To compare the differences of the two:

As occultist you get an easier league start, profane bloom, hexproof curses, 35%ish more damage (15% more and -20% chaos res lowering) 60% chaos res, and no enemy life regen. As ascendant you get permanent flasks, easy access to an amazing unnatural instinct jewel location, and better forbidden flame jewel options (occultist only really has heart of destruction/basion of elements, neither of which poison bv can fully utilize, whereas scion can get a slayer flesh jewel for 30% aoe/no phys reflect, and culling strike). Permanent flasks allow going for bismuth flasks with a 40% res suffix, giving 80%ish all res. From your quicksilver flask you get a consistent 40-60% move speed (depending on if you get 14% movespeed suffix or not). And for bossing, permanent jade/granite flasks are also very nice.

For poison BV your clear speed is dictated by AOE (explosions, the bv itself) and movement speed, both of which scion has more access to, at the cost of damage. Fortunately, an endgame poison BV does so much damage that this shouldn't really matter.

The biggest barriers to start the build is a divergent herald of agony (we need the poison chance), a ming's heart which were decently cheap in kalandra league(1 div was the cost for a near perfect roll) and asenath's gentle touch which again after 1-2 weeks are 30c (but are most likely going to be 2-5 div for the first week).

Budget pob: https://pastebin.com/yyfEcEH0

Endgame pob: https://pastebin.com/h9nQqL9J

Edit* made a quick change to the endgame pob, forgot to add in the unnatural instinct