Absolute Erasure and Abolishment are both risky abilities, I thought Abolishment would be something else and I change my stance considering Absolute Erasure is something certainly more lethal.

You certainly have to be picky with these abilities considering they delete just about anything on a grand scale. If you erase the concept of pain, that'd mean the entire multiverse is affected so choices of what to delete would have to be very thoughtful.

I'll say Absolute Erasure

Absolute Erasure, definitely!

On a second note what would happen if one used Absolute Erasure to erase itself?

Abolishment can overturn Almighty Laws, which affect everything. If you were to erase a law of physics, then you would probably destroy our universe in some way, so it stands to reason that doing the same to an Almighty Law without appropriate caution would have similarly disastrous effects on everything.

Absolute Erasure can be similarly catastrophic if used carelessly. It can erase anything on all levels, so it's entirely possible to erase something so completely that it never existed in the first place. You might not even know that you erased anything at all, and that's assuming that no butterfly effect type problem occurs, where the lack of the erased thing throughout all time causes massive changes, even if the erased thing wasn't very significant. And that's not even considering the capacity to erase concepts and the like, which could feasibly affect everything. If used carefully though, Absolute Erasure can be highly beneficial - e.g., erasing injuries, limitations, the lack of something, etc.

Meta-Concept Manipulation is a tricky one. Certainly, some of the meta-concepts further beyond the norm could cause damaging mental effects if the power doesn't protect you from those, and trying to manifest or utilise such concepts could have detrimental effects on reality. However, I feel like with appropriate care, it would be possible to utilise lower level meta-concepts in ways that wouldn't destroy reality or something like that.

Existential Distinction is probably the hardest to judge in this regard. The main risk, I feel, would be to your identity, personality, sense of self, etc., since, by definition of the power, you must be distinct from those things. The difficulty comes from the fact that to be completely distinct from everything, you must also be distinct from the lack of those things. You must be distinct from yourself, but also from everything that is not yourself. In general, the nature of Existential Distinction is to be distinct ("recognizably different in nature from something else of a similar type" or "clearly separate and different") from absolutely everything - if it is, you are not a part of it and it is not you, as you must be distinct from everything that is. If it is not, you are not a part of it and it is not you, as you must be distinct from everything that is not. You could even go further: if it neither is nor is not, or both is and is not, or is beyond is and is not entirely, you are not a part of it and it is not you. Basically, it's something entirely other. The page seems to try to solve this with the idea that the user can "forgo, include, and deny [everything]", meaning that they can go without anything, choose to include anything within their existence ('existence' being used very loosely here, since they should also be distinct from existence) - which should mean they can include things like an identity, personality, emotions, etc, in themselves - and deny anything, essentially allowing them to decide not to be a part of anything, even totality and the grand design, or not to include something in themselves. So if this is the case, then its feasible that this might not be that much of an issue - however, it's far from certain. In this sense, I would argue that Existential Distinction would be the riskiest to possess, since if you can't choose what you include within yourself, or you can but include nothing by default, then the risk to your sense of self and all that entails is inherent in the power. On the other hand, the risk presented by the other powers can generally be circumvented with careful use.

So not even a power that’s just as powerful as absolute erasure can bring something back erased by it?

Well, just erase the fact that you erased what you erased

Absolute erasement

Being erased is scarier.

Abolishment is stoping from function.

Absolute Erasure is complete irreversible remove.

Meta Concept Manipulation