These are all insanely overtuned. Please never.
There is an alchemical root effect already, but it comes from poisons, is single target, and is already pretty decent.
I could see there being issues with a potion that allows any level of oblivion damage, as it's supposed to be a rare damage type that you have to really make sacrifices to have in your build or the oblivion damage itself is very low, but the others seems like they'd be okay with tuning. If someone wants to give up the sustain provided by tri-pots, more power to em. I doubt an AoE stun on a 45 second cooldown is build-making or build-breaking, either, since it'd 99% of the time be better to just slot a CC anyway. Basically everyone with even the slightest idea of what they're doing runs a snare removal skill though, so that area of the game (and others) needs to be fixed up before potions start getting more effects.
An AOE root & snare, and an AOE stun are things left to 5 piece set bonuses or slotted abilities. Definitely OP if we could source those via potions. We can already get similar effects on one target via a poison which forces us to forego an enchantment.
While it would be nice to have a couple more viable sources of oblivion damage, a complicated potion probably isn’t the answer either. And I would imagine that damage would have to be capped like other sources to prevent abuse.